Re: LT1 performance
12.9-13.2 should be pretty good. If the air fuel is within .5 of the target you shouldn't have much left in the tune(you may be chasing .02-.03 at that point). Radial tires will pick you up .10 or more. With 121 mph it seems like it's way down on power.
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Jimmy "Cooter" Hidalgo, Jr.
4865 E/SA '04 GTO
4865 SS/GA '99 Firebird
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