This is where I get lost…

What was the pinch Sq/inches before and after port work ?

Andy calling that a “Moon Rock” might have been the funniest thing I’ve heard a guy say in awhile

That tolerance is more than acceptable. Heat expansion will add up to well over that. With extreme conditions, coil bind gets within .050. That is about the minimum once you add in heat expansion. With room to play. I bet when you examine your pushrod length and it will have greater variation than that.

Hello, would you try polishing the intake ssr to fix the noise? Thanks for sharing, -juhana

Sir I think that's a REV brand valve .descent valves ..should do just fine

Nice! Strobe can be from an a/c light (60 hz) and recording at 60 frames a second

Charles....thank you for sharing. It takes time to do these videos and we appreciate you.

Soooo.... are these the Promaxx Maxx? They have different heads, not just 1.

041 x heads fixed and modified.Better than any gm stock head modified.

Hello this is the Magnum template guy, I got a set of the EQ heads and doing a little porting, mainly cleanup of the casting which has a lot to be desired compaired to my cracked Magnums. The question is did the EQ valves have the anti-reversion lip? Mine do but the Magnum valves don't, either intake or exhaust. So should I use the Magnum valves or just back cut or texture the EQs for better low lift flow. This is for my 73 Duster that is a cruiser not racing. Will be going with a low lift cam .450?? and just want low end torque. Really enjoy your videos.

You have done some very good videos on head porting and it is going to be interesting how these heads turn out. Have ever thought about doing a short video on the use of flowballs? Such as showing what happens when they are used and what should be done after seeing the results.

Promaxx is one of the best deals on heads out there.

Copy of the brodix ik200

CHINA . Why are AMERICANS Supporting China who steal & copies our technology then under sells USA killing our economy.. BUY AMERICAN.. USA 🇺🇸

Can't wait to see how much more gooder you make them.😎👍

I have sold those with the black coating. For someone that want's that look they are great. I have sold a few sets of these. They work really well with blending the top cut into the chamber, and yes the short side has a decent shape, but can be improved. On the exhaust I cut a 75° and fix the short side as all of them have not been near as good as they should have been. Also I open the pinch at the top [trapezoidal] as per D.V. I have put them on a couple of 383 with 11to1 with 238 @.050 Hydraulic roller camshaft and they perform quite well. 600 hp. ? I have my doubts.

Thank you Charles for the review! Would you happen to have any changes to review & flow the GM's factory 113 aluminum heads? I've got 2 pairs of them and would like to know what's restricting them besides the obvious stock valves

Is pretty fast? Wouldn’t that make it “pretty fast”?

BRODIX Racerite.

Charlie, have you any experience with the Ebay heads sold by Deep Motors? They appear to be very nice castings with a good finish. They are some of the least priced heads I could find.

I just bought a pair. Mine does not have that black coating. And the edge isn't sharp. You sure thats a ProMaxx head?

Nice! I have been eying Promaxx Mopar heads

580hp potential out of the box on the intake, needs work on the exhaust though

You should also cut the plenum divider down about 3/8in. It greatly improves fuel distribution, and because of that is worth around 8hp.

I'm lightly porting my Brodix heads right now, the fit n finish is Aweful, the flashing is terrible, chunks started breaking off when I started grinding, bolt on my ass. 3 valves didn't wanna come out, seals not all installed, plugs don't thread all the way in....

Why not meaure all the valves and move them around if there's different stem heghts for a more even install height. The last set of Elgin valves i used all measured exactly the same length. When doing the valve job with stones i usually do an end chamber first. Then do the other end chamber next till its the same depth. I load a valve in each. If i place a machinist straight edge from valve tip to valve tip it shows me how deep to make the middle chamber seats so all the valve heights are exactly the same. It takes some time pulling pilots and checking but very accurate.

Can this be applied to the dividers in an intake manifold for a straight six?

Hi, gr8 video, now i want that tool😂😂😂, just a thought, if you have the time, what about trying each valve in one seat installed to see if there are manufacturing differences, if there are, installing - removing- checking this measurement for each valve individually in each seat could result in closer numbers in this measurement....on another note, hand grinding valves to mate to seats- it can be measured how much grinding results in how much this measurement reduces....

Use the valve for that specific hole. Lapping with fine compound might give a thou.

I would cc the cambers when done that small amount will be hardly noticeable, main thing is your spring seat pressures are even, and your not throwing your rocker arm geometry off .....

Welcome back Charles!! My sbc has got cylinder pressure of about 115psi on most of the cylinders except on the 6th cylinder which has got 85psi. I enjoy driving and wouldn't perhaps even notice if yet another cylinder would drop to 85

I set spring pressure up +-.010 Mainly because that is my thinnest shim. If you actually test every spring in a set and profile their spring rates you will find they slightly vary too. Spending a bunch of time for perfection rarely returns a noticeable difference. If it’s good it’s good.😊

Surely its down to the spring rate... X thou x Y Ilb/inch. I.e. What's the variation in seat pressure?

Just remember Charlie that the only number that is relevant is the number that relates to the actual valve that will be in that hole. Without knowing the manufacturing tolerance on the valves, you might be doing a lot of work for nothing. I'd suggest that you measure every valve in the same hole to verify the assembled height of each valve. They 'should' be extremely close, but are they?

Check out Powell Cams video on Camshaft 101 Ep#5. He talks about using the valve spring height mic and easy to make mistakes. P.S Ended up getting a set of EQ-CH318BA heads for my 5.9 Magnum rebuild and now trying to pick the right cam for it before head back to FL for the winter.

Like to see a dyno or an ET of some of your work.

Doing those cross sections is really interesting.

Learning a lot from you guys! Thank you so much

Very Interesting! I can't wait to get to do some playing on my flow bench I picked up and start learning.

CNC Hands Servedio 😅 I tell everyone that your hand porting looks better than anything that comes off of a CNC milling machine.

I did this same test a few years ago. I used a bore sleeve off the head deck and used exhaust pitot tube to measure velocity around the circumference of the intake valve. Because of the 23 degree valve angle and chamber design you can not get consistent velocity around the valve. When you used the long wand it shows atmospheric pressure smacking the string, this is why it was bouncing around. Checking cfm this way is a waste of time in my opinion. The cylinder head sits on a cylinder bore. If you go crazy and enshrouded the chamber to much you will kill the head.

looks like the air/fuel mix, like the dykem, is slamming into the straight up and down wall of the long (missing) radius. what good is an atomized a/f mix after it slams into the wall and breaks up? the long radius is just that. a radius, not a straight wall. an hour glass shape is much more efficient.

,,,,,,,,,,,,,,,,high school,,,,,wow,,,,you started young,,,,,,,Wish that I had,,,,,,,,,I started doin my own heads in the 1980's , with my harleys.......got all the sioux stuff you showed,,,,,,good to have kwik way stuff,,,,black and decker too..................stones require lots of hours to perfect a valve job.........I can take my heads to my big guys machine shop,,,,and with his Serdi setup,,,,he'll cut the three angles with one pass......but you know all that..............thanks....

How much would it cost to get a set like these done?? Never been ported??

Hey Charles, I'd like to have you port my edelbrock tpi intake base- it's the same as a tpis big mouth base. Is this something we can make happen? Thanks

It seems like the only good option is to create valve size stagger and optimize each port for the valve being served….. what I don’t think makes sense with the poly quad is replacing all four valves. I think replacing one intake with larger should serve the goal.

As DV says, flow is not everything, its flow velocity, flow density, and discharge coeficiant, so, before you brag and have to eat humble pie, make sure you understand a lot more than you do know!! I will laugh my butt off if you lose! I dislike braggers like you, my brother in law was one. I dont regret him being gone !

11cfm difference is fantastic, that's like a 2% difference worst case scenario. Would you bat an eye if you saw a 2% difference in compression across an engine? 2% variance in leak down? I wouldn't. Keep up the good work sir.

its flowing in reverse and not hooked up to a head which i would like to see.