Thanks for that! I'm glad you showed how to do this without checker springs, and just using the actual valve springs. Well explained Sir.

I believe you are wrong, Where the roller touches the valve stem is where the line should be drawn to (but you can't) Don't believe me? Draw a right angle on a piece of paper, place the Rocker's Trunnion center on the Horizontal line with the Roller tip on the Vertical line at a 45. Sweep the rocker through the arc (I place a small white dot on the side of the roller tip) and see where arc is and you'll notice it is on the Tip of the roller is where the true center of the fulcrum should be. Kind of makes sense it would be at the tip eh?. (at least for my roller rocker)

I have a set of older TFS twisted wedge heads on my Corvette. They require different rockers and pushrods for intake and exhaust. The sharpie marker method is exactly what I used to get it right. Good advice and great video explanation.

This is the best/ easiest to follow video on rocker arm geometry I have seen yet! Great explanation! Thanks for taking the time to make the video.

Very well done! I learned something here and will now always have it.

you need to point out this procedure is at the base of the cam lobe, you also need to point out this includes the head gasket and head is torqued to spec.

That was great info helped me out alot. All my questions are answerd

Great Video, Thanks for taking the time to put this out there... not to much info on this topic. Huge Thanks from New Zealand.

This was Very good explanation, thank you. I do plan to incorporate this method in my procedure on my engine !

Hey thanks for a great and informative clip! I will be looking for more.....

I learned something today to back up my method !😊

Great video! Thank you very much for making it

Bro nice vid, love the powerfist dial indicator, I have the same one it must be a Canadian thing :)

very very important part of building that the average everyday person dont know about. thank you sir for this very detailed set up video.

GREAT VIDEO , TWO THUMBS UP

Sweet thanks for the help. I have a 8.1 I'm working on

Excellent method

Very helpful!

Really a good explanation 🌹

Good job. Thank you.

Looks good!!

Thanks for the info

Looks right to me, i learned the same procedure many moons ago, it works every time,👍🏻💯

Thank You Sir!

SIR WITH ALL DUE RESPECT IT'S NOT TRINYN ITS LIKE ONION TRUNYUN TRUYON LIKE ONION ALL THE BEST AND THANX FOR YOUR EXPLANATION ON ANGLES 👍👍😉

The caps lock and exclamation point make me very excited about this

I have an idea... once you have your first line. There should be some kind of simple math that would allow you to calculate the angle to make a 90° at full closed. I'm sure it would change depending on cam lift :/ If that is possible though. all you would need is one of those cheap angle finders and mark your closed line off of the smooth edge of some masking tape. Then use the smooth edge of the tape as the line in the video and not even need to make a mark on the rocker.

Very good methodology tho

I did mine with the mid lift method, but the roller is out on the exhaust side closer to the edge. It's a sbc with a hydraulic roller and + .100" valves. If I put the sweep in the center, the patern is about .125" wide. With it out about 3/4 of the way out, it's only around .050" wide. I haven't fired it up yet, but I'm thinking of putting lash caps on it just to be safe. Got any advice? Scorpion 1.5 rockers btw.

Interesting

go to lowes and get a laser that shoots the + dual lines and use that to check the 90 degrees, much better than a sharpie, on line on the valve stem, one line for the rocker

If you have no idea of the camshaft specs , how do you measure the lift? Do you measure the travel of the valve spring?

Needing to find pushrod length for my build, the cam I installed has different lift for intake and exhaust so for proper geometry I should run different length pushrods?

good

The proper method isn't primarily a "BULLSEYE" center stem pattern, but the minimum RA from/back ARC swing movement. That will translate to the most full transfer to linear vlv movement.

Is rocker arm ratio the same as mechanical advantage? If no, how are they different?

When working with a hydraulic lifter is it still necessary to use a solid lifter for this method?

What do you do when you try this method and don't have enough threads sticking through the pivot shaft to even begin to thread on the nut?

Who is the best engine builder in the world who taught you this just asking

I tried using this method, but in order to establish the 90 degree angle (with valve closed) and getting the mid lift, I need to have longer rocker studs. What am I doing wrong?

Thx

don't seem to be enough threads on that nut/bolt to hold it 5 turns and that's it dang the nut will come off half way down the track

You are a genius. What is that guage that's measuring how far down the spring is going called? I should get one of those and try this method. I'm using pedastal non adjustable rockers though, but I'm assuming I could accomplish the same thing with shims? I don't know....I'm just trying to do a GT40P head swap on my mustang with an explorer intake and custom cam. Nothing too major, but I want to do it right the first time.

Ti retainers. Great investment.

I have a Chevy 01 cavalier 2.2. 134l that I have built for oval track and would like to put roller rockers on but have no idea what components to use I would have to tap the head for studs. I believe the ratio is 1.5 stock camshaft with hydraulic lifters. It has pedestal mount rockers now but the bolts are very light duty and I am running 6500# valve springs. Just rotating the motor broke one of the studs off. I believe they have to be self aligning rockers. I seen this motor with roller rockers so I know it can be done I just don't know what parts I need to accomplish what I want to do, any help would be greatly appreciated,thx

I'm trying you're method but i have Howard's link bar lifters(ford 289) When you spin the motor to check 45 degrees angle at half lift my plunjer in the hydraulic lifter will collapse .also when checking valve tip mark. Doesn't it give you a false reading? Thanks

this is BY FAR the best video I've seen. but I have a question since I'm learning. do you not need some softer springs to do this?? I've seen it on some other videos and hears it before. thanks keep it coming !!

All good info, where can I get a mag base like yours? Mine won't stay put on my aluminum head like yours does.

Are high quality roller rocker arms best for all automotive gasoline piston/cylinder engines (from the humble little 4 banger all the way up to those monster V-12's and beyond)? If not, couldyou cite examples of where would rollers work best?

Good info.

good video, But I have both 1.5 & 1.6 rockers, where & how do I plug the math into the equation ? Or does 1/2 @ 90 still apply?

This method is great unless your rocker stud is too short to achieve the first 90° setting.

I take this measurement was done with the cam lobe on its base circle ?

You didn't mention if this was solid or hyd roller. Nor sis you subtract for the lash or have a light spring for hyd setups. Pooor t best.

Doesn't look centered to me in this video

I see you bought the optional aluminum magnet for your dial indicator

I had an engine built 20 years ago. The pushrods were too long and the rocker rolled off the edge of the valve tip and ruined the valves . Now I know how to find the right pushrod length but what about the lash? Doesnt that change the geometry? I'm running a hydraulic roller. 0 lash then a half turn preload is my understanding. Is it that the lash won't make enough of a difference to throw the geometry off? I had a head gasket problem. Can this be caused by the incomplete lift of the valves and getting a lean condition that blew the head gasket. It's a 347 vortec V1 s trim with ported first gen twist wedge.

Thought it wasnt advisable to turn the engine over with pr checker installed.

great method, but clearly not at 90*.

570 lift 285000 everyone knows where you determine those numbers from! Right

Must be solid lifters?

How do you determine that is a 90*?

Good lesson but that $13 tool they make now takes all that work away lol just set it on in place of the rocker and bring pushrod checker up to it and there u go

Good video but you drew the wrong line on your rocker arm. The line of action is from the rocker pivot to the roller contact point, not the roller center. The valve only cares about what contacts it, the roller OD.

I tried this method on a 302, pedestal mount rockers. ,no.way this worked , nor even close to being a 90