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its not that you can't run lower octane fuel its a matter of not being able to run enough timing to unlock the power of the engine. there are alot of variables to consider altitude weight base timing and mechanical advance. the 383 in the wifes buick came from my truck where anything lower then 91 would cause it to ping and rattle seems to be just fine in her car with with 85.
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1976 Custom Deluxe SWB Med FMB.3/4 Drop.
Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out.
1997 K1500 ext cab 5.7 stock except muffler
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