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Re: 72 250 6 cyl cam?
yeah I assumed since IIRC 88?? was when GM went to full roller
Given the low zinc content in todays conventional oil, I may add some Rislone zinc additive. Not sure what was used by PO's. Motor has about 116k mi on it but runs quiet as a mouse
with that said I used conventional 10-30 in my flat tapped hydraulic 327 motor without issues
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