Front pulley offsets are for the mismatches between motors and transmissions being used . If you are running a pre '65 or 65-69 motor; an offset will be required. These primarys start with 1/4" and go to 1 1/2" increments of 1/4". Tapered offset inserts are available in 0, 1/4", 1/2" and 3/4". An offset may also be required if your frame calls out for it or if you are using a fat tire kit.
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