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Re: SBC 350 Aches and pains
At least on US spec. engines, In 1971 GM dropped the compression ratio from 9.0-1
to 8.0-1 and started " Induction hardening" the valve seats in the heads to allow the use of
unleaded gasoline. Glad you are able to repair your engine backfire issue Philip!
All The Best
Dirk
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