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Boss 302 Build Seal

Going to a one-piece rear main seal involves cutting the block with the same equipment used for boring cylinders. Jim cuts the lip out of the main cap used to retain a two-piece seal. Once the lip is cut, the No. 5 main cap will accommodate a one-piece seal. The lip must be machined off the crank as well. This is an easy task for any machine shop.
How To Build A Better Boss 302 Engine

 Going to a one-piece rear main seal involves cutting the block with the same equipment used for boring cylinders. Jim cuts the lip out of the main cap used to retain a two-piece seal. Once the lip is cut, the No. 5 main cap will accommodate a one-piece seal. The lip must be machined off the crank as well. This is an easy task for any machine shop.  View Related Article

 

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