Not Ranked
CI v. Aluminum main clearances shouldn't be any different. The caps are steel regardless of block material. And when cross-bolted, the top half of the bore, be it ci or aluminum, should stay put.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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