Head flow

 

SuperStockAMX wrote: To say one person is the end all in cylinder head (AMC or otherwise) work, is fooling oneself. That goes for anything in life. Just because some of you can't find 270 CFM on un-ported 2.02" / 1.68" heads (which held the National Record and were completely inspected for legality by accomplished tech members of NHRA), does not make the job impossible. Like you said, Ken, you do have room to learn and I hope you get there someday.  And I imagine my engine builder would put you to shame on cylinder head work on any level; not to mention the rest of the engine. He's 58 years old and has been doing this since he was a teen. Since you don't want to believe me and you really do think 300+ CFM is out of touch with reality on an AMC production head, call up Adkins and Allen and tell them you have a bridge to sell also. Because they have -291 & -993 production heads going low 9's at 143 or so with 3200 # cars. .  Stickshifter, I see you have made improvements to the car and ar now only .15 away from the formula of 1320 / MPH = optimum ET which you previously stated wouldn't work. I believe the last time we discussed this you were running 8.25's or so. Congratulations, you're getting there. 7.95 is still obtainable @ 166 MPH. Good luck.

Jeff it doesn't take you long at all to discredit poeple does it?your 1st post in this subject and almost every response thereafter...again if you want to discredit people then it would be more in line for you to discredit someone with their car on jackstands that have not raced in years...

I have spoken with Rick Kemph, he worked for Mullin and Co back when they did the pro stock stuff for Booth, he has all the specs from back then and looked up a set for me, back then they flowed heads at a different depression so he converted it to 28 and said it was about 340 or so. I know that peak flow is not a good indication of hp potential for a head as it is only at peak once and is at lower lifts twice, you can get two heads on the same bench that flow 300cfm at .700 lift and it is quite possible to install on the same engine with the same camshaft and have one set make much more hp because the low lift numbers/port velocity were way better on it.

SKeown wrote:    Jeff, if they didn't catch the exhaust crossovers being welded up, I doubt the tech had a clue what he was looking at in the first place.    SKeown

Exhaust crossovers being welding is perfectly okay as long as any work done does not extend into the port.  Quote from NHRA rule book, "Heat riser passage may be blocked from the intake manifold side of the cylinder head.  Blocking passage down in the valve pocket is prohibited."  They do not limit how to block the heat riser passage.  Over the years, I have used furnace cement, molten aluminum, plaster of paris (my favorite), and welding.  I have never had a cylinder head kicked out in tech.  Over the years, I have been reponsible for 57 national records being set, 43 national event class wins, 31 divisional races won and 5 national event wins.

Edited by Class Guy - May/12/2010 at 12:36pm