Send it back.
I have'nt heard of this before. Trying to figure what advantage it would be. To modify or adapt a rear main cap seems like work for no net gain.Jon,
I purchased a crankshaft from Bryant that is drilled for both BBC and BBF flywheel patterns. The problem with this is the journal that the seal rides against is reduced to BBC size. My understanding from Bryant is that this is fairly standard these days. My question is how do you install the BBC rear seal in a BBF block? Do you offer an adapter for this sort of thing? I'm running a cast iron Eliminator block.
Looked at the pic. It may be because of the dual Chev./Ford flywheel bolt pattern. I believe the Chev. pattern is a smaller diameter.If you go to Kaase's website, look at the picture of a Bryant Crankshaft. Look closely at the rear journal on the crankshaft. You will notice that the rear journal is turned smaller in the area where the rear seal rides. Normally, this is slightly larger than the 3" main journal, approx 3.140".