I'm am rebuilding a 70 400. Does anybody have proven method for rear (rope) main seal install? Is there a rubber seal available? Help!! Want to do it right the first time.Seems Pontiac manual describes procedure if upper is still in block.They want you to pack it 1/2 inch into cavity and then pack two more 3/8 pieces on each side of the upper.So what do you do from scratch?
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