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Originally Posted by jonsonton
Has anyone done this?
I have a set of '87 350 TPI IROC heads and I want to put them on my '87 z28 with a 305/4BBL. I want to know if I can expect a power increase and if it is practical to swap them?
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You can expect a power decrease, the 305 heads have 58cc chambers, the 350's have 64. You'll end up with less compresion and less power as a result.