I do have a performer rpm intake as well. Ya know I keep seeing guys say the 215cc runners are too big for anything under a 455 but yet the rest of the speed world would disagree. There are tons of SBC heads and ls1 heads with 215 cc runners and obviously not for a stock motor but they seem to run pretty well on a 350-400ci motor. I know your smarter than me on this Steve but I feel that while not optimized should still be just fine. Obviously it would like the higher rpm range but I think it will be OK.
And yes I've played with more than 350 hp in a few different builds, even my stock truck makes more than that.
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