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As John said the cranks themselves are different. And you do not have to remove the crank to replace the 1 piece rear main seal. You have to get the trans out of the way and then the seal is inside of a carrier that bolts to the back of the block...you have to drop the oil pan some though.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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