Engine Building Part 7 - Measuring for Pushrods for a Chevy Small Block Chevy 350

Рет қаралды 158,522

6 жыл бұрын

How to measure the valvetrain for proper pushrod length.
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Пікірлер: 234

@charlesfry5371 5 жыл бұрын

That is the simplest way it's been explained so far. Now I'm ready to determine what my push rod lengths will be. Thank you sir for sharing your wisdom.

@PetesGarage 5 жыл бұрын

I'm all about making it simple. Thank you for watching

@victorgonzalez1766 3 жыл бұрын

I did the same thing as you but my car won't start What could be the problem

@jakefriesenjake 2 жыл бұрын

I did it like he shows us 16 years ago. I'm now refreshing my motor with new cam. Its a sbc 381 stroker with less than 100 miles on it, in 16 years. (working on car). Any way, 16 years ago they must have sent me Ford roller rockers. I didn't know much about correct geometry, but I did know about the roller tip riding on the center of the valve stem. Mine was centered but the pattern was quite wide. The pushrod was shorter than it should have been, to get the witness mark on center. At half of the total valve lift, my rocker wasn't 90 degrees to the valve stem. Small block Chevy rockers (trunion center to roller tip center) is like 1.380" while Ford is 1.436". Mine bloody rockers are 1.436"! So, needless to say, I'm selling Harland sharp stud mount ford's and going with a shaft mount setup. Gotta do the "1/2 total lift" method of checking for proper pushrod length.

@77cuti 4 жыл бұрын

Great videos, im currently building my first chevy 350 and you are helping me a great deal thank you.

@PetesGarage 4 жыл бұрын

Thanks and good luck Mike

@skeetloc123 5 жыл бұрын

Great job. Thanks for making this not so damn complicated. 👍

@PetesGarage 5 жыл бұрын

I try to make it as easy as possible

@jmcenterprises9591 6 жыл бұрын

Thanks Pete, another great video in the series.

@PetesGarage 6 жыл бұрын

Thanks my friend

@kosworkshop 3 жыл бұрын

Thank you for your time and wisdom sir. Very helpful videos and I enjoy the ones for those of us who just getting ready for our first build.

@PetesGarage 3 жыл бұрын

Very welcome

@Bullwinkle1969 4 жыл бұрын

straub technologies has the best video for stud mount roller rocker geometry!

@PetesGarage 4 жыл бұрын

I've seen that, it is good

@GroovesAndLands 4 жыл бұрын

Wish I could like this comment a thousand times over. The approach shown in this video here is totally shadetree, and ignores actual in-use valvetrain geometry. Sadly, when combining various aftermarket components, compromises must be made. Yes, it's great to have the contact between the rocker tip and the valvestem be nicely centered. But it's far more important for the angularity between rocker and valve to generally be correct. Because the rocker sweeps through and arc, the angularity can only be "correct" at one point thru the arc. Straub shows how to set it so the angularity is correct at mid lift, which is a good compromise. Depending on your heads, valves and rockers, achieving correct angularity MAY NOT result in a perfectly centered contact between rocker tip and valve - and that is a worthwhile compromise, considering the rest of the geometry has been optimized.

@timbauer5605 4 жыл бұрын

@@GroovesAndLands i like the way you say angularity

@donovankennebeck2286 3 жыл бұрын

@@GroovesAndLands I saw the straub video and was looking at using that to get my pushrod lengths for my build since my cam has different lift for intake/exhaust would that mean need two different size push rods?

@WesAdams-HillsideAuto 2 жыл бұрын

Bull, I totally agree!!! It’s the right way of setting it

@charlesmartin7347 4 жыл бұрын

Once again Pete you manage to make me look smart in front of my wife which is no easy task . She's even bought us matching T-shirts hers said I'm smart and mine says I'm with her . Hmmm🙄

@PetesGarage 4 жыл бұрын

Thanks Charles, she'd be smarter if she bought Pete's Garage T-shirts teespring.com/stores/petes-garage

@melvintuckerjr2450 6 жыл бұрын

Great video !

@kurtpoblenz2741 5 жыл бұрын

Olympic wrench guessing team........ I had to stop the video & laugh at that one 😂😂😂. Great, informative video Pete. Keep em coming 🤘🤘

@PetesGarage 5 жыл бұрын

It's a tough team to make

@Dwg67 5 жыл бұрын

Thanks Pete that was a great video

@PetesGarage 5 жыл бұрын

Thanks my friend

@jb-ik8sj 4 ай бұрын

This is the easiest way I've seen yet on determining pushrod length.

@PetesGarage 4 ай бұрын

Thanks

@HeyLanny 5 ай бұрын

Good job on the video and camera was clear and set up well. Thanks for a great educational video.

@PetesGarage 5 ай бұрын

You are welcome!

@p3medeiros1 2 жыл бұрын

By far the easiest way explained on how to figure out pushrod length , every other video is take the lift divided by 2 an have a dial indicator. Blah blah blah, this is simple an makes so much more sense.

@PetesGarage 2 жыл бұрын

Thank you Patrick

@p3medeiros1 2 жыл бұрын

@@PetesGarage no problem defiantly the easiest an makes the most sense to measure this way.

@prasanthmoolethodi3152 6 жыл бұрын

Thank you

@jekinneys 2 жыл бұрын

Lol, the funny part about using a ruler. Always try to measure from the 1 inch not the end of a ruler. Made my day, thanks. Machinist use the 1 inch instead of the end incase the end of the ruler is damaged. More accurate. Do you "have to" nope, just cracked me up.

@PetesGarage 2 жыл бұрын

Thanks Jason

@otherstuffbybob 6 жыл бұрын

Thanks Pete

@briannielsen7176 Жыл бұрын

Thanks for the advice this seems like the easiest video I've seen so far on the length of the pushrods. All the other videos did all this extra math which was really confusing. This is the first time I ever built an engine so I'm looking for simple. I just don't want to start the engine up on the test stand and hear bang bang and then the engine is shot. The closest I've come to any internal engine work was to replace the timing belt on my son's 2002 ford focus. When I went to start that up the butterflies were welling up in my gut since I didn't want that bang bang bang noise and the engine is shot. On that car it took me a week of endless hours and many Utube videos to figure out the correct way to install a timing belt. Believe me I felt a complete since of relief and jubilation when the car started and ran properly.

@PetesGarage Жыл бұрын

That's awesome, thanks Brian!

@barrykilts4506 3 жыл бұрын

Thanks for the info,it all helps!

@PetesGarage 3 жыл бұрын

Glad to help Barry

@mcrickyd32 Жыл бұрын

dude your vids are so helpful and awesome.

@PetesGarage Жыл бұрын

Thank you my friend

@tonybustos2396 Жыл бұрын

Very informative, just got the right size rode in, the other got bent when the timming chain broke on my 88 chevy big block

@PetesGarage Жыл бұрын

Thanks Tony

@bakesee 6 жыл бұрын

Thanks for the honorable mention (lifter conversation)!

@PetesGarage 6 жыл бұрын

I must admit I'm curious as to why you want that video.... I can't find any old lifters to use as samples and the technology is pretty simple

@bakesee 6 жыл бұрын

Pete's Garage really more interested in unraveling the mystery of how a hydraulic lifter actually works...solid are solid, no secret there. But how can valves actually open and close at the right time, and at the desired distance when there is any ‘give’ in the mechanical linkage connecting them together. That’s the mystery to me that I hope you can help me (and hopefully others) understand. Thanks Pete!

@PetesGarage 6 жыл бұрын

Ok, I'll make it

@tobiaswillson5900 6 жыл бұрын

oil and oil pressure will create a hydraulic lock vs bleed down with in the lifter , custom hydraulic lifters can be made with different bleed rates.

@tyclute1454 2 жыл бұрын

Normal guy showing a normal way to due something! Great vid!

@PetesGarage 2 жыл бұрын

Thanks my friend

@harleyquinn2689 5 жыл бұрын

i would like a bottle opener, plus i subed and liked the vid, and i turned on notifications.

@PetesGarage 5 жыл бұрын

Text me your address

@ViceGripGarage 3 жыл бұрын

You mentioned the lifter depressing with too many turns of the rocker nut. I'm assuming you're using a pumped up lifter, right? The spring should depress before the lifter, unless you're running a really heavy spring

@PetesGarage 3 жыл бұрын

Yes, but you can bottom out the lifter

@shaunmorrison1438 3 жыл бұрын

Hello need help rebuilt motor chev 4.3 and it burns oil could it be i put rings on wrong white smoke out exhaust

@johnvineyard67 6 жыл бұрын

also,, what about adjustable pushrod guide plates,? your roller on valve stem looked a little to far to the right,

@PetesGarage 6 жыл бұрын

They are adjustable. I was most interested in the left to right geometry. I will cover front to back in the installation video

@allan7934 6 жыл бұрын

To bad these sort of video's weren't available decades ago when I was in H.S. It would of helped push me with math more. That said. These videos you are doing are fantastic. I would be hard pressed and surprised if you don't start pushing a million sub's at some point. The educational value and every other aspect are done to earth easy o understand.

@robfletcher8762 6 жыл бұрын

People prefer to look at fast cars and buy off the shelf drop in parts, sadly

@allan7934 6 жыл бұрын

Agreed. Even more sad, I don't know if H.S. even offers Autoshop anymore. Sadly I wasn't interested back then.....what a dope. Would have learned so much. Didn't realize I would want to know more later.

@PetesGarage 6 жыл бұрын

The interesting thing Al is, I struggled to get help with my car when I was in H.S. so I decided to make these videos for anyone looking for the same help. If this type of information was available I would have had a much different career path.

@the1coolkidd 6 жыл бұрын

Pete's Garage explain...

@PetesGarage 6 жыл бұрын

I started working on cars in the early 80's. There was not much information available. Everything was a secret, machining was a secret, nobody would tell you how to do anything, I had to learn by trial and error. There were also no schools geared towards building engines so unless you had a connection or worked as a helper in a machine shop, there was no way to really learn. So I spent my life going to college learning all of the reasons why and how things work the way they do. I spent 7 years as an Engineer for GM in an engine assembly plant and learned even more about how engines are made. I put all of that experience together and started making videos to help people who are starting where I did. My goal is to share what I know, learn what others know, and help as many people as I can. I never claim to know everything, I make lots of mistakes, but when we learn together we are a community that grows together. Perhaps if I knew all of this way back then I would have a shop that is the most popular shop on TV today.

@richardgalli7262 5 жыл бұрын

Thank you Pete that was very informative. Working on a ford 400 (6.6L) engine with closed chamber heads (351c). I am a machinist and have a 24" Mitutoyo vernier caliper maybe I can make the adjustable valve push rod tool.

@PetesGarage 5 жыл бұрын

That's a nice tool to have

@jakefriesenjake 2 жыл бұрын

They are like 25 bucks. Most men love new tools.

@richardgalli7262 2 жыл бұрын

@@jakefriesenjake amen

@macfranks2456 Жыл бұрын

You can not get a correct pattern on the valve stem with the hydraulic lifters installed and the regular valve springs. Valve spring pressure will push the pushrod down to the bottom of travel every time you rotate the engine through. You have to install checking springs to get a proper rocker arm to valve tip pattern.

@PetesGarage Жыл бұрын

Interesting

@Milner62 4 жыл бұрын

Good video. What is your opinion on doing the length of the pushrod to have the line between center of the trunnion to the center of the roller pin to be at a 90* angle to the valve stem? I saw a video just now showing that technique and was thinking of doing that but your technique is the same way that I was told by a old engine builder I know through work that said to just set the rocker arm with the roller tip center on the valve and measure the pushrod length.

@PetesGarage 4 жыл бұрын

You are trying to choose the length so the sweep of the roller goes across the center of the valve tip. Too long or too short will make it stay towards one side of center.

@charlesrichardsjr.158 5 жыл бұрын

Damn Pete, you slapped me in the back of the head.

@PetesGarage 5 жыл бұрын

Is that good?

@charlesrichardsjr.158 5 жыл бұрын

@@PetesGarage I'm hoping so, I've got something tapping in my engine. My rods are not bent and my rockers are good. My neighbor's an engineer told me that it doesn't sound good so i'm confused. I'm thinking hydraulic lifters might be the cause. The only thing else I can think of without pulling the engine apart completely would be the water pump. I don't have the money to take it to a garage but I have some hopes seeing the rods were not bent. Even used glass to make sure.

@kbilly118 5 жыл бұрын

Do you ever use offset lifters to help with the valve train alignment issues? I'm installing Holley heads on my SBF 302 and they're known for valve guide wear, from what I'm reading. When I was mocking them up, I ordered the solid guide plates and they did not line up, so I switched to the adjustable ones. Just wondering if offset lifters would remedy that type of misalignment.

@PetesGarage 5 жыл бұрын

I have never used them. If they are offset the right amount it looks like they would help.

@rodpalm6398 4 жыл бұрын

Works better to use light valve spring for this.

@PetesGarage 4 жыл бұрын

It can be, thanks Rod

@GrandFunalleyMedia 5 жыл бұрын

I like using the push rod checker tool with jam nuts. The ones without them are just to much of a PITA.

@PetesGarage 5 жыл бұрын

That is true

@thomasknoeller6402 Жыл бұрын

Hey Pete, I have a 68 Camaro SS CLone, its real nice and it has a 400 SBC, with stock heads, a nice cam and Edelbrock Manifold. I'm thinking of putting on AFR heads and was going to put Roller rockers on and leave the current cam and lifters. Do you see any problem with doing that, and do you have a suggestion for the rockers? Thanks Tom

@PetesGarage Жыл бұрын

I don't see any problem with that.

@arthurfricchione8119 3 жыл бұрын

Pete, I’m halfway through the video and the rocker roller looks. Off center of the valve after you adjusted the pushrod length. Maybe it’s the camera angle. Now back to the video. Artie 😊🇺🇸

@PetesGarage 3 жыл бұрын

It's the camera angle

@DJones942013 5 жыл бұрын

When checking for push rod length with a hydraulic flat tappet lifter, should you take into account the amount the plunger in the lifter moves because of the spring tension? Or just set preload and go with the measurement given?

@PetesGarage 5 жыл бұрын

Just set preload and go with the measurement given

@robertmacpeek424 3 жыл бұрын

Add half the amount of plunger travel (like what the lifter & pushrod see @ mid lobe lift) to your final number. Mine was perfect at a 7" pushrod. Both int & Exh valve stem tips were dead center. Adding the preload factor in means I need a 7.050" pushrod. Plunger travel for my hyd rollers was .090" , half that is .045" so since most all readily available pushrods come in .050" increments a 7.050" is what I need.

@johnvineyard67 6 жыл бұрын

with what you just did,, and it just so happen a stock push rod was correct. do you have to use hardened push rods.,? or stock push rods not suggested.?

@PetesGarage 6 жыл бұрын

Since the valve springs are pretty low pressure a regular push rod is fine

@jra19741 6 жыл бұрын

Hay Pete I didn't see how you got the that black mark on the rod??? Thanks

@PetesGarage 6 жыл бұрын

Those heads actually came that way. When I install the rocker arms I will change it to something that makes it easy to see, it will be in that video

@bluemalibu1742 5 жыл бұрын

What brand are the rockers

@clashofclams19 4 жыл бұрын

What kind of rockers are those they look stainless i wanted a set would you recommend?

@PetesGarage 4 жыл бұрын

Those are Elgin SSR-840RS stainless rockers. They work great

@mafosa9563 4 жыл бұрын

where did you get the rockers? thanks inadvance! larry

@PetesGarage 4 жыл бұрын

Those are available from Summit

@C10chevy85 Жыл бұрын

Did you replace the valve springs with test (low tension) springs? I have a Comp cams length tester and wondering if I can check the length using the installed springs. The closed is 130 and open is 310. Thanks.

@PetesGarage Жыл бұрын

I did not since they were roller lifters. You can use those springs to check

@slickrickdarula9483 Жыл бұрын

If I'm going with stock heads but getting them ported would that change the lifter length?

@PetesGarage Жыл бұрын

It will not

@dennis6325 3 жыл бұрын

Pete. I am jumping into the details here, but I have a concern doing it the way you described. Since your hydraulic lifter is not pumped up full of oil, doesn't the pushrod collapse the lifter during valve opening and throw everything off doing it this way? It seems with the hydraulic lifter compressed the rocker arm would be off center on the stem shifted towards the carb side. Is there a way to modify the hydraulic lifter so it won't compress during this measurement to better facilitate getting the correct push rods length? Also, do you check multiple push rod locations and take an average so the rod length is the same for all 16 push rods?

@PetesGarage 3 жыл бұрын

Great point Dennis, you can feel the lifter collapse so you can stop before it does. Unless the cam is ground wrong they should all be the same.

@tyclute1454 2 жыл бұрын

I know this is an old video, but there is a great video on how to stop the lifter from collapsing at "Nofoxgivin" on youtube. Found the video earlier. It involves a simple lifter modification. Really the best way to do it.

@ShadowFiend198400 5 жыл бұрын

Am i good to go with 35 thous extra on the gasket with same pushrods?

@PetesGarage 5 жыл бұрын

Sure

@genjackdripper5651 3 жыл бұрын

Trying to understand how you checked that the roller was hitting the center of the valve. Did the roller make that black mark? (Fantastic videos!)

@PetesGarage 3 жыл бұрын

I put the mark on the tip of the valve with a dry erase marker

@johnytorres8770 4 жыл бұрын

Dose the rocker arm stay floating like that .it dont need to be at the bottom of the bolt.

@PetesGarage 4 жыл бұрын

Correct

@johnytorres8770 4 жыл бұрын

@@PetesGarage thank you pete

@bowtiekid329 2 жыл бұрын

There is a more accurate way to check the pushrod length. Put machinist dye, or a black marker on the valve tip, so that when the roller moves across the stem of the valve, it shows a tattle-tale line of roller movement. The marking should be about an 1/8" of movement from the center of valve stem. Use a SOLID lifter, identical in length to your lifter you're gonna run in your engine, to eliminate any slack when measuring the pushrod length! Using a hydraulic lifter will cause the plunger in the hyd. lifter to colapse when the lifter starts it's upward travel. Adjust the pushrod checker in/out until you see the correct pattern on the stem of the valve. If you need to recheck, then wipe off and remark. MEASURE THE PUSHROD CHECKER W/A DIAL CALIPER TO BE PRECISE, AND NOT A RULER! WHY ARE YOU CHECKING THE PUSHROD LENGTH, IF YOU'RE NOT GOING TO BE PRECISE! Defeats the whole purpose.

@PetesGarage 2 жыл бұрын

Thanks for the comment

@johngranato2673 Жыл бұрын

Absolutely!!!!!!!!!!!!!!! Especially regarding the use of a sold lifter. And, if you don't want to pull an intake manifold off an assembled engine, use of light valve springs to prevent hydraulic lifter plunger collapse. I also use an adjustable push rod checker that has been treated with blue loc-tite. This prevents inadvertent rotation of one end of the checker versus the other end As a result, this requires the use of pliers to lengthen or shorten the checker.

@KingJT80 7 ай бұрын

because its a street engine, not a high RPM race engine and this has worked fine for a bunch of people. FOR DEACDES not saying youre wrong, but this will get you a good pushrod length without being overly technical about it

@C10chevy85 Жыл бұрын

I am installing roller rockers and trying to establish the mid lift angle. I drew a straight line from center of bearing to center of roller tip. I am unable to get the 90 degree to the valve using that method. I tries your method and I see the mark in the center of the top of the valve. Two different sizes gave me the same result. 7.645 and 7.880. The 7.880 was established by twisting the pushrod until I felt restriction to the rocker. Then I turned the nut 1/2 turn. The lifter was compressed just enough to be below the ring inside the lifter. Is this correct?

@PetesGarage Жыл бұрын

It sounds like it

@Derekbitt1 6 жыл бұрын

I am learning as much as I can about this subject and I am hearing some very respected builders say that proper VTG is not necessarily based on a centered sweep. It is more of an average adjustment of the whole unit from the lifter through the pushrod then through the rocker to the tip of the valve. Just because the rocker tip is centered on the valve doesn’t mean the apparatus is adjusted correctly. What is your opinion?

@PetesGarage 6 жыл бұрын

That is true, but you have to start somewhere, and the middle is the best place. That is why I say to turn the engine over several times to see how it sits and moves throughout the rotation.

@Derekbitt1 6 жыл бұрын

I respect your process very much, I have watched most of your engine building videos, but I’m not so sure about your technique here. There is an awesome HOTROD mag article on VTG That made a lot of sense to me.. thanks for your time and your videos

@PetesGarage 6 жыл бұрын

So I read the article. The sweep path of the roller must start at the center in neutral position as I did. I do say to rotate the engine a couple of time to see how the roller moves on the valve tip. The article states that the roller should not come within .020" of the valve tip which of course makes sense. They were using a cam with lift up to .580" which is quite a bit. I can understand your concern if you had a rocker with an odd angle, but most rockers are fairly straight. For the average engine builder, maintaining close to a 90 degree with the pushrod and keeping the roller close to the center throughout the entire valve open event is more than sufficient.

@Derekbitt1 6 жыл бұрын

Pete's Garage thank you for the conversation. The best possible VTG is the centerline of the trunion and the center of the roller tip parallel with the valve tip at mid lift, centered in the valve tip. If we can accomplish this the sweep will be minimal and cause less wear... Scott foxwell has a video through Straub Tech that illustrated this well. I used this video and the HOTROD article to form my opinoin... we can lose lift with a wider sweep path. Thanks Pete

@PetesGarage 6 жыл бұрын

I do see your point, it does makes sense. I learn something new every day. Thank you for sharing that.

@omarrr6679 Жыл бұрын

how do you measure 7.2 when those heads are recommended a +100 longer than stock push rod (7.9) is every head different or? thanks

@PetesGarage Жыл бұрын

The deck was machined

@jasonconaway69 Жыл бұрын

Question. Just got engine back from shop. The rockers seem to be very close to the intake side of the stem. Looks like machine shop got wrong pushrods. What’s the best way to check pushrod length on heads and motor already assembled? Roller cam. 330lb springs. Last motor I used light spring, added .030 for lifter preload, and .015 for head gasket. Had a good center mark on stem. But once assembled heads with valve springs and head gasket the rockers were way off center. Not sure what happened there? Looking for some direction. Thanks!

@PetesGarage Жыл бұрын

Turn the engine over by hand and watch the valve tip and pushrod end. Look for any potential binding spots.

@jasonconaway69 Жыл бұрын

@@PetesGarage ok. So eyeballing plus the .030-.050 for lifter preload will be fine on a mild sbc?

@magnum3192 4 жыл бұрын

Pete have you ever used Launiti cams or lifters and have you ever had lifters rattke when letting of the gas from crusing speed??? 440 Mopar with Harland sharp roller rockers have 9.030 pushrods

@PetesGarage 4 жыл бұрын

You'll be fine after setting lash correctly

@magnum3192 4 жыл бұрын

@@PetesGarage Thanks Pete it purrs like a Kitten now.....Really appreciate your expert Help looking forward to more 440 Mopar Builds Mike

@PetesGarage 4 жыл бұрын

That's awesome! Glad to help Mike

@superduty4556 5 жыл бұрын

Well this is a far simplified version of something that is easily overcomplicated. So all I have to do is adjust to a length that is close to center on the valve, turn it over a few times, check the mark and repeat if necessary and measure?

@PetesGarage 5 жыл бұрын

Yes sir, that's it

@zacatecano1986 3 жыл бұрын

Can that tool gauge handle the spring tension ?

@PetesGarage 3 жыл бұрын

The dial indicator just measures

@WhitfieldFamilySportsGaming 4 жыл бұрын

Where can I buy that same exact pushrod length checker at

@PetesGarage 4 жыл бұрын

You will need to know the range you need www.summitracing.com/parts/cca-7702-1

@christianwise4403 4 жыл бұрын

How did you keep your hydraulic lifter from collapsing too much doing this?

@PetesGarage 4 жыл бұрын

They will collapse slightly

@david676adghj 3 жыл бұрын

Pete's Garage should you presoak them before? Or just use the fresh new lifters

@giuseppedeacetis1894 3 жыл бұрын

Hey Pete if I’m running stock push rods and a 1.5 roller rocker should by Roche stud be 3/8 -20 or 3/8 -24

@PetesGarage 3 жыл бұрын

Depends on the head

@giuseppedeacetis1894 3 жыл бұрын

It is a stock l98 head

@PetesGarage 3 жыл бұрын

7/16-14 on some 3/8-24

@kennethbode2017 4 жыл бұрын

do you need to measure one on each head?

@PetesGarage 4 жыл бұрын

It's a good idea to

@michaelmckenna6852 Жыл бұрын

Can your rocker arms sit all the way down on the rocket stud and not damage anything or does it have to be off The rocker stud

@PetesGarage Жыл бұрын

It can

@michaelmckenna6852 Жыл бұрын

@@PetesGarage thanks bud

@nickspall4552 3 жыл бұрын

So the rocker does not need to sit all the way down on the rocker stud?

@PetesGarage 3 жыл бұрын

Not on this one

@brents4729 3 жыл бұрын

Shouldnt this be done at 1/2 the valves total lift? Then you get a 100% accurate reading since youre splitting the difference of the travel of the roller during the cams rotation

@PetesGarage 3 жыл бұрын

That is true Brent

@camtwo1466 2 жыл бұрын

If your customer paid for you to disassemble those brand new E-Street heads and have them checked for proper fitment between valve guides and valve stems,spring heights and spring pressures;- Would you actually do it or would you say its overkill ? Also if its part of a rebuild service and to your service only pertains to used heads would you take money off the rebuild fee if your service was a flat rate of say $2850?

@PetesGarage 2 жыл бұрын

That is a tough question. If they wanted it, I would do it, sure. Overkill is a matter of preference. It really depends on the condition of a used head. Sometimes It's cheaper to buy new heads unless you're trying to maintain matching part numbers.

@briannielsen7176 Жыл бұрын

I measured a 7.918 on my 12" micrometer. What size would you go with them. The mark left by the roller was in the middle so I'm assuming it was in the correct position. I noticed there was a 7.950 and a 8.000. maybe I'll take the micrometer and measure 7.950 and make that test pushrod that length and see how it looks. Or I might go down from the 7.918 and see how that looks.

@PetesGarage Жыл бұрын

You can buy pushrods in 0.010" increments

@maniacal-s10 5 жыл бұрын

Grate video pete . From maniacal s10 please google.

@PetesGarage 5 жыл бұрын

Thanks my friend

@jb-ik8sj 4 ай бұрын

So is it commom to have 5 or 6 different sizes of pushrods? That could get pricy

@PetesGarage 4 ай бұрын

No, they are usually all the same length

@jb-ik8sj 3 ай бұрын

@@PetesGarage lmao. I ordered a set made by BTR through Summit. 7.375". Not 7 3/8". The tolerance was that of the later! They ranged from 7.384" to 7.389". 5 were the same length. Are the hard to manufacture or what? They supposed to be +/- .001". Right? No quality control at all. Do they think people are not going to check? Another 10 day delay in this build. Thanks man

@einstein3509 Жыл бұрын

I have a question. Why would my engine builder use 1.6 rockers on the intake and 1.5 on the exhaust? I can run 1.6 on all of them if I want to. I’m just not sure why he did what he did. He’s a hard guy to get ahold of or I would ask him. He built me a 383 stroker running “according to his Dyno” 500hp 520tq Cam 234/242 Intake cam lobe 374 with 1.6 rocker = 598 lift Exhaust cam lobe 382 with 1.5 rocker = 573 lift The heads have 205 intake 160 exhaust valve. Using a comp roller cam and comp short travel hydraulic lifters. According to Comp the springs he used are to weak and that why my valves a floating at above 5800rmps So I’m planning on installing the right springs and a stud girdle and installing those ultra pro magnum roller rockers. Just not sure if I should change that set up from 1.6/1.5 to 1.6/1.6 Oh and the heads “according to Brodix” are good for a 640 lift. Any explanation for that set up?

@PetesGarage Жыл бұрын

The reason for that is to open the intake valves a little more. The exhaust is under pressure so it is forced out.

@devildogae 4 жыл бұрын

Do you measure for lift?

@PetesGarage 4 жыл бұрын

Yes I do

@chickenfoundation9323 2 жыл бұрын

Should I check for all valves it just 1?

@PetesGarage 2 жыл бұрын

They should all be the same

@coffeecandan44 3 жыл бұрын

Is this procedure standard ? For all chevy ?

@PetesGarage 3 жыл бұрын

I've used it on many engines

@inscoredbz Жыл бұрын

How are those Elgin rockers holding up? I heard many builders say they are junk Chinese rockers. Of course you never hear the good of a product, just the bad.

@PetesGarage Жыл бұрын

I've never had a problem

@chassisaligner 4 жыл бұрын

so much for that measuring tool

@PetesGarage 4 жыл бұрын

@chassisaligner 4 жыл бұрын

@@PetesGarage your abusing your tool

@lit549 4 жыл бұрын

@@chassisaligner you ARE a tool

@chassisaligner 4 жыл бұрын

@@lit549 ditto!!

@GroovesAndLands 4 жыл бұрын

He's referring to the way Pete rolled the engine over and cycled the valve with full spring force on an adjustable pushrod, which I guess Pete got a way with because these are mild springs. Don't try this with a real set of valvesprings - remove them and install "checker springs". Also, before following this "centered according to my eyeball" approach, PLEASE PLEASE look into the 90º angle between rocker and valve @ 50% valvelift approach!!

@The_black_sheep 2 ай бұрын

What cam do you have ? 3:47

@PetesGarage 2 ай бұрын

Comp 12-408-8

@dickeymoore4264 4 жыл бұрын

My pushrod measurement came to 7.850 can I use a 7.900 pushrods?

@PetesGarage 4 жыл бұрын

You could, but why not get the right size...

@dickeymoore4264 4 жыл бұрын

@@PetesGarage ok Thanks and is it normal to get a extra long pushrods length when changing roller rockers and studs I usually get 7.300 with retro hyd roller camshaft and lifters now I got 7.850

@PetesGarage 4 жыл бұрын

That's over 1/2", any idea why so much?

@dickeymoore4264 4 жыл бұрын

@@PetesGarage I have no idea maybe wrong roller lifters I ordered a comp cams 853-2 and will try with that roller lifter

@truthseeker5970 4 жыл бұрын

Just curious how you measured this way without considering preload on the lifters?

@jasperpipes4222 6 жыл бұрын

Valve train geometry is a vigorously debated subject and there is a lot of conjecture on correct methods. I personally prefer to : 1) Use a light weight test spring when an adjustable pushrod is fitted. 2) Use the cam mid lift procedure to set geometry. 3) Mark the top of the valve stem to get a true indication of not only contact point but sweep size of the roller through its cycle.

@PetesGarage 6 жыл бұрын

That is a very good procedure

@daveyhouse 5 жыл бұрын

I do the same as you Jasper, I look for minimum sweep across the top of the valve stem for less side load on the on the valve. But with test springs, its better to use dry erase marker because of not enough pressure wipe the permanent marker off

@victorgonzalez1766 3 жыл бұрын

I did the same thing but my car won't start What could be the problem

@PetesGarage 3 жыл бұрын

No idea

@briannielsen7176 Жыл бұрын

How come other people take the spring off the valves and put a spring you can move with your hand? It looks like their way is just a bunch of added work. The one guy claimed it might bend the test pushed.

@PetesGarage Жыл бұрын

There is not reason to remove the springs, you're right, lots of added work

@antoniotorres1396 2 жыл бұрын

Wouldn't the lifter collapse tho with that strong valve spring

@PetesGarage 2 жыл бұрын

No, oil is not compressible when it hydraulically locks

@antoniotorres1396 2 жыл бұрын

Sweet thanks man

@Nirosh_Dewakpriya 4 жыл бұрын

Suppa

@PetesGarage 4 жыл бұрын

Duppa

@jonbovideadoralive 3 жыл бұрын

Wuppa

@joseortega1114 2 жыл бұрын

Hey its jose ortega I have the same lifters but with aluminum roller rocker arms

@PetesGarage 2 жыл бұрын

Awesome

@joseortega1114 2 жыл бұрын

@@PetesGarage I was hopping you would help me

@PetesGarage 2 жыл бұрын

With what?

@joseortega1114 2 жыл бұрын

@@PetesGarage push rod length

@joseortega1114 2 жыл бұрын

@@PetesGarage I've seen 7.400 to 7.900 and 7.100 I'm try to decide

@jb-ik8sj 4 ай бұрын

U weren't worried about bending the adjustable. Interesting. The other video's I've viewed say don't do that. But damn. U did it. I odrered a set of 7.375" rods not 7 3/8". They were within tolerance if I ordered them @ 7 3/8". But I ordered them @ 7.375". That tolerance is supposed to be +/- .001". These ranged from 7.384" thru 7.389". How accurate should push rods be? I hear competition cams is dead on. But then they are more than double what I paid. Also should u check all the rockers? Or should u trust the manufacturer's of the rockers & lifters? Dumb question I guess. Since those 2 could be in different countries. And do they have competent quality control??? Trust no one. Right? Lol

@PetesGarage 4 ай бұрын

I've never had a problem. I can tell you stories about quality control. I would check them all

@kennethchoyce8186 5 жыл бұрын

Hi I was told roller cams are not compatible with E-street heads which cam are you using?

@PetesGarage 5 жыл бұрын

That is not accurate. The cam type has nothing to do with the heads.

@johnstewart7675 5 жыл бұрын

why did u not lock the bolts on cam!!!!!!!!!!!!!!!!

@PetesGarage 5 жыл бұрын

I did, but the video shot got screwed up and I couldn't use it.

@chrisburnsed6349 7 ай бұрын

This info is totall off from what I was told. I was lucky enough to spend a full day with a nhra pro stock engine builder who told me that proper rocker geometry is when the cam is at 50% of total lift the rocker should at that point be level with the head and the rocker is dead center of the valve stem. NOT when the cam is on the base circle

@PetesGarage 7 ай бұрын

That is probably true for pro stock engines

@turbotorana4336 4 жыл бұрын

pushrods come in 50 thou increments

@PetesGarage 4 жыл бұрын

Depending on the engine and the push rod diameter, length can be in .100" down to .005" increments. You can even have them custom made to length

@paultester1544 3 жыл бұрын

Everything in this video is completely wrong. You set your rocker geometry first to find out what length pushrod you need.

@PetesGarage 3 жыл бұрын

Thanks Paul

@lildeena1 5 жыл бұрын

A little confused in the end you didn't use the ruler you used a caliper for a more precise measurement off camera?

@PetesGarage 5 жыл бұрын

I did use a ruler, measured 7 1/8"

@bowtihi6830 4 жыл бұрын

Im guessing the lifter should be primed to do this.

@PetesGarage 4 жыл бұрын

No, if the lifter is primer it will be stiff. It's easier to do when they are dry.

@jeffreydurham5342 3 жыл бұрын

No disrespect sir, your information is incorrect. Center of the valve means nothing. Search Straub valve geometry, he explains it. Jim Miller explains it even better!

@PetesGarage 3 жыл бұрын

Thanks Jeff