906 Head shop

moper said
In my experience, the numbers you posted have never, ever been verifiably achieved with a 2.08 valve. Not by anyone I've ever spoken to or read about, anywhere. Even professional (well respected) iron head porters can't touch within 20cfm of your results with a 2.14 valve. No disrespect intended, but something isn't right. I dont run 2.08s. But typically I can get 250-260 at .500 with a back cut 2.14intake valve, a clay radius, and a 4.25 test bore. The performance of the car backed up these numbers. As I've said, I do not test my own heads and dont test every set. But that's my experience anyway.

I have to agree with you moper, That # is quit high for a 2.08 valve, Now a member on Moparts had a set of 906s that were "hogged" out literaly, i'm thinking 2.14 valves, the ports were extreamly thin, he showed me pix, They flowed right around .300, They spent alot of time on them, His car ran the #s for sure, 6.3s at around 109, He finally dropped a set of blended Eddys on it, Car ran faster, His porter told him it would because of the port design, With the cam he was running the 906s just couldn't keep up & stalled out, mine were in the .250 range at .500 lift, with a back cut, tailering the short turn, bowl blend beyound the MP templates quit a bit, alot of runner work, taking down the bosses, spent a good 25-30 hrs. on them, gained a solid .2 & 2 from stock, the valves already had the backcut, in the heat, car was running 11.0s @ 120-121 before the work, after the work car ran 10.8s @ 123+ with a lessor 60ft. in the same DA.