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Per FrankR those base gaskets are #313065 or Sierra #18-2901-9 for a two pack. The late motors have rubber mounts. He told me long ago that spring mounted exhaust housings take the old gasket #304314/Sierra #18-2894-9 is the two pack. That’s the best way to keep it straight. The gasket under the water pump for the gearcase shaft is #303339/Sierra #18-2891-9 for the two pack. -9 is for the 2 pack in Sierra. Not all vendors carry these. Just drop the last digit and order two if they don’t reconize the two pack # (NAPA). Hope that helps!
Edit: The early ’54/’55 CD motors take a third gasket #303467 that is different. Only available from BRP. Sorry for the misleading info. I don’t think FrankR told me this after all. I figure he knows better! You learn something everyday.
Attn: joesnuffy
Dan in TN