Re: 38 heads
I think sharp made aluminum heads that the lower studs didn't need to be replaced. If you are going for a little compression boost. Mill the iron heads. The cooling advantage or not... (more advantage with a cleaner block, which you can do with the heads off and a coathanger or long screwdriver roddin the block) and maybe weight difference... is not that much on a street stockerish.
by the way... just my opinion.
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