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Hi; Most of the factory Original were a Single row, an Alum. Sprocket with nylon teeth on the cam (good for less noise & a shorter life) . The marine, bus, HD Truck had a double row roller with metal Sprockets. The 3-Bolt was used on the 440 - 6 Pack & Hemi engines along with roller type chains. Some of the HD car engines came with double row roller but I don't remember which ones
Dave V. 62 Imp.
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