Little Big Chief - Part II: Assembling The Long-Block - Pontiac Tech
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A neoprene B.O.P. rear main seal was used because installation is easier and sealing is better than the rope seal, according to Craig Wise. What can't be seen is the silicone sealant used to fill the holes in the cap that normally secures a rope seal when the final torque is applied. If the holes aren't filled with silicone sealant, there's a very good possibility the rear main seal will leak. View Related Article
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