Originally Posted by allforspeed

i find it hard to believe that some ported stock casting 5.3 heads would outperform some AFR 205cc heads that were redesigned from the ground up just to make horsepower. there is something going on with this that doesn't make sense? was compression the same? etc.

can you guys at texas speed verify that this chart shows 5.3 ported heads outperforming AFR 205cc heads??