Fits the 1/2" shafts that MSD, Pertronix, Mallory and most HEI distributors use, but these gears are not available from them or anywhere else that we know of. Fits most Correct Craft, Ski Nautique and other ski boats with right hand engines plus twin-engine 351W boats usually for the right hand engine with these distributors. Electronic distributors turn either direction. Comes undrilled on purpose so that you don't try to use the original hole and end up too high or low on the shaft, and is shipped with an instruction sheet showing the correct placement. Duplicates factory Rockwell "C" scale hardness to be compatible with stock or cast iron camshafts. We've sold hundreds of the reverse gears to fit the stock Prestolite .531 shafts and this is the same gear except drilled for the .500 shafts.
NOTE: If you have the stock Prestolite marine distributor with the .531" shaft, we have those too on this site.
NOTE: We usually have the Pertronix electronic 351W distributor and can sell the distributor with the gear installed. Call 1-877-253-7882.
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