Installing Early Model Crankshafts Into Late Model Blocks? Sometimes you gotta do what you gotta do. If you're installing an early crankshaft into a late model (86 and up) block, you'll need one of these kits to correct the difference in rear main seals. Unlike other two piece rear main seal adapters which force you to also convert to a late model pan as well, Stef's offers both. These billet aluminum adapter kits include all the specialty mounting hardware gaskets.
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