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So I have been racing my car with a drip from the rear main seal or retainer or possibly the oil pan gaskets, So last weekend I put a Mancini retainer and seal in and new good oil pan gaskets and we took it out for a few test pulls and get it back in the shop and it still has a couple drips hanging off the bell. I just cant see with how nice it all went together that it could possibly leak. Now I am thinking it has to much crank case pressure. I have a big k&N breather on each valve cover and no pcv. Would a crank case evac to the headers fix this drip?

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If you run a full exhaust I would say dont bother
with the exhaust style evac... greater than 5"hg back
pressure will cause the exhaust to back up, burn out
the check valve and start pressurizing the crank case

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Its definately not coming out from up top. It either has to be the rear seal , retainer, or oil pan gaskets, Unless it is coming out of the cam plug or a oil galley plug. I might pull the tranny out this weekend and see if I can see anything on the back of the block. I have 3" exhaust with Dynomax Bullets and turns out in front of the tires so I would think it would pull enough vacuum. Do those evac kits seem to help?

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Hook up a combo gauge to the back of your valve cover
and see what you have going on

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Are you certain that you have the 2 pan bolts that screw into the seal retainer shorter than the other 18 bolts. Some of these dopes(mr gasket for one) will ship you in their pan bolt set, all 20 the same length. When torquing bolts into the retainer they will bottom out before pan gasket is cinched and you cannot see this if engine is in car when installing pan.

As flywheel cover tucks up over pan at rear, a pan leak will appear to be rear main leaking.

Take two 5/16 x 18 pitch 1 and 1/2 long grade 8 bolts, cut off heads with a dremel tool making studs. Use these with nylock nuts and lock washers as retainer pan bolts.

I posted a very long thread on my recent misadventure on all this a few weeks ago when I installed the Mancini retainer and a Road Race pan.

If you already aware of shorter bolt requirement at retainer,please excuse me for butting in.

As an aside, the first retainer that Mancini had sent me was mis-drilled and the pan bolt holes were more shallow than they should have been which made my initial leakage even more severe.

All is well now, but was a real pain getting there.

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I was running the Mancini retainer on my 512 and pulled it twice to re seal. The last time I found that the seal retainer was hitting the nuts on the #5 main cap thus preventing it from fully seating. Changed to a stock type retainer and no more leaks. I could've also ground a couple of grooves in the Mancini retainer enough to clear the nuts on the studs.

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