Can you give us more of the specifics of your combination: weight, rear gear, trans gearing, tire size, trap speed and RPM, 60' times, distributor curve, compression, intake, cam specs, fuel system, ignition and any other important mods made to the engine? Then we can start to get somewhere!
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Steve B.
GSCA #2173 (1986)
67 GS 525 Stg IV
66 GS Convertible
65 GS HT
63 Riv