When I ran my 67 (670's) GTO last year, I ran Sunoco 94 in it and it ran just fine. I never tried 91 though. Now, with my rebuild, I bought the TRW L2440 (beveled edge piston) and it should get me down to 9.5:1. I'll feel a bit more comfortable running at 9.5 instead of 10:1.
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Brian D'Amico
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