1970 455 main seal
Note that Fel-Pro BS40654 is the Viton version, BS40032 is the plain rubber version. The Fel-Pro Viton seal is still only about half the price of the one from BOP Engineering. The Victor Reinz version is even less. Wanna bet they just repackage one of those into their box?
I've not been the one promoting that item, since it is still split to fit over the crank flange. It seems like the answer to the question no one asked. I've been using the FelPro seals for decades with no issues.
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