The LS6 wasn't aluminum, and I don't think the LS7 was either. If memory serves me right, the LS7 was an over the counter option. More compession ( 12 to 1 ? ) and open chambered heads....

Bill Cross
Gales Ferry Ct
1970 LS6
1969 sb vett
2002 LS1 vett
2002 Monte Carlo SS

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