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That crossed my mind but I already acounted for the camshaft seal in the upper end seal/gasket kit and besides it doesn't seem to fit that opening.
I already have the oil pump drive o-ring out of the same kit. This extra o-ring is pretty small, about the size of a dime. I can only think of it being for the newer style oil pressure relief valve, but don't know for sure, since I am still using the old version.
Both of these are from the lower end gasket set.
Thanks for the replies though, any other ideas?
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