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Join Date: Nov 2012
Location: Northern Wisconsin
Big Block rear main seal question
I've been chasing various oil leaks on my 496 since day one. The last one appears to be the rear main. I put the dye in the oil and traced it to the rear main, oil pan gasket or oil leaking in between the main caps (no sealer on the edges) it looks like the rear main. I removed the flex plate and full of oil I put the engine on a pretty good angle so the oil level is higher than the seals. I left it for a while and you can clearly see oil leaking past the seal.
So with that said, it's time to fix this once and for all. The engine is a Mark IV 445 block. Two bolt block with four bolt caps installed. Block was aligned honed for the caps and studs. Does this mean I need a rear main seal that is made for an line honed/bored block? I don't really want to remove the crank but can if I have to. The crank is/was new. I've seen a special off set rear main seal on a 400 small block but not the big block. I've also read that some have taken a thin strip of metal under the new seal to take up the oversize ?
I'm looking for tips and advice as it's not going back in until it's fixed.
"... the very powerful and the very stupid have one thing in common. They don't alter their view to fit the facts, they alter the facts to fit their view." Dr. Who, 1977
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