I don't know of any documented alu head 1970 LS6 engines installed at the factory in any car. In 1971 Chevy built a small number of LS6 Corvettes with alu heads. The LS7 was going to be sort of a L88 but 454 instead of 427. It was going to have alu heads. The LS7 program was canceled but a steel head LS7 was sold over the parts counter. All the hi po parts you wanted were in the chevy hi po parts catolog in the 70s.
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