I've sene those. My first experience was with a Pontiac. But I gotta say it. If you're having trouble gettin a 2 piece rear main seal to seal properly, you're doin something WRONG. (Not meaning YOU specifically) Millions upon millions came from the factory not leaking and millions upon millions have been replaced successfully. People just fall for the stupidest crap sometimes. It's all marketing to get your money. Use a good quality 2 piece rear seal like these engines were DESIGNED FOR and install it right and it won't leak.
