Since I'm the guy with the leak proof Best Gasket rear main seal,let me tell ya what I did.Nothing at all really,the square section seal sits kind of loose in the block or main cap as compared to a traditional rope seal.I didn't overly pack in the seal,just followed the Mfg's direction sheet.This seal is loosely woven,I'm thinking it designed that way for a pupose and packing it too tighly will cause problems.
