Isn't this an aftermarket crank? If so, they generally don't have the serrations that you typically see for the rope style seals.
I've always used the 2 piece BOP seals with excellent results as long as the crank seal surface has a smooth finish.
Just out of curiosity, when you installed that rear main cap, you did use a bit of sealant on the face of the cap that sits on the machined surface of the block......correct??
That is a common source of a leak that makes it appear to be a rear main seal, and I still see that little detail missed on occasion where people forget to put sealant in that area. Just thought I'd mention it.
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2019 Pontiac Heaven class winner
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