Good friend of mine had a drag car w/ a 440 w/ a decent solid FT cam, M1 intake, dominator, and stock 346 heads.
He wanted to upgrade to a 493" stroker, but didn't have the money for heads so we put together a good 493" bottom end, but reused the cam, heads, intake, etc.
It ran 7.30s in the 1/8 at 440".
It went 7.20s at 493". Converter was a lil tight w/ the 440, pretty sure the extra stroke just made better use of the tight converter. [/quote]
Had a good friend do the same thing with a 351. Stroked it to 393", got a new custom ground cam from Bullet but, kept everything else the same including the factory iron heads that he'd worked over himself years before.
I was at the track with him during it's maiden voyage with the new motor. He did not tell anyone until later that day what he'd done over the Winter. As far as we knew, he just freshened the motor. He was all over checking floats, timing and etc. He was frantic and not happy. Car went from 7.50 to 7.38 in the 1/8.
Everyone had the same thought, he simply reached the limit of what the heads could do. A set of AFR 205 aluminum heads later and the thing picked up almost a whole second in the 1/4.
