New Guy - fuel question for a 1969 GTO - Page 2 - Pontiac GTO Forum
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post #11 of 12 (permalink) Old 08-28-2019, 06:16 PM
 
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A stock 400 350 hp will run fine on 93 . My built 463 550 hp runs well on 93 .
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post #12 of 12 (permalink) Old 08-28-2019, 09:19 PM
 
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I have a 66 389 W/ 3x2 and 10 to1 comp. I do not use any additives and I've been running fine and cool with 92 octane. I will add stabil 260 when I fill it up before winter storage in Michigan. Just check your tune up and timing and try pump gas at first. You should be okay.

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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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