Fits the .500 shafts that MSD, Pertronix, ChevProMarine, Mallory and most HEI distributors, but these exact gears are not available from them or anywhere else. Fits most Correct Craft and other ski boats with right hand rotating engines plus twin-engine 351W boats usually for the right hand engine with these distributors. 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 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 machined for the .500 shafts.
NOTE: If you have the stock Prestolite marine distributor with the .531" shaft, we have those too available elsewhere on this site.
NOTE: We usually have the Pertronix marine electronic 351W distributor D231800 or D231801. Order online or call 1-877-253-7882.
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