Quote:
Originally Posted by Pedigo Perf
In 1970 Chevy offered the aluminum head as a factory option on the big blocks. This change is consistent with the other years with FACTORY optional aluminum heads.
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Thanks for the clarification, makes more sense now. Only thing on the plus side of it is that if the aluminum head gets HP the steel head will not. Just looks like they opened up another can of worms with other combos having aluminum and steel heads on the same combo and not being separated.