LS1Pariah

LS1, small cam 365rwhp. Forged pistons, stock CR, fresh rebuild 1500 miles. I do track days in the car, did my first last weekend with the fresh motor. Had back VC ports capped, very loosely, after two laps was getting smoke, came in and was leaking. Looked like rear main, also cap was gone from drivers side VC, oil on firewall. 5 qts in motor, 3qt accusump. Recapped with a tight cap, went back out, smoke again, came in and oil coming from rear main area only. Uncapped both sides, ran hoses into water bottles, ran 40 minutes, no smoke, no rear main leak. After session, drivers side bottle was full, pass side had maybe 2 teaspoons in it. The track has a lot of right hand turns, so the oil ol would have been going to that head. Other routing is as follows: Pass VC front port, to throttle body, catchcans.com single can between LS6 valley cover, and intake manifold port, no PCV valve. After the weekend, did a leak down of the motor and 8% was the highest, so motor appears fine. Any ideas what the hell is going on? Never had this problem before rebuild. Never ran ls6 valley cover or catch can either though.

S10xGN

iTrader: (11)

FWIW, I "blew" my rear main seal just by running for a few minutes with the flat LS-1 valley cover and breather-less aftermarket valve covers. These motors are sealed tight! After replacing the seal and punching in a pair of breathers, no more problems.

LS1Pariah

But, I already have the ls6 valley cover, and stock valve covers with two ports in pass side, one in drivers side.

Remnant-of-VII

...don't cap off your valve covers dude. That's why you're spitting oil out the main seal.

LS1Pariah

Seen diagrams, and been told by two different local LS1 shops to cap them. But as I said, when they are uncapped, oil shoots out of them everywhere.

S10xGN

iTrader: (11)

Do a leakdown, sounds like your rings never seated if you're pushing that much oil...

LS1Pariah

Already did, 8% was the highest. That isn't the problem.

lemkerailroad

questions

what is the difference in ls1 or ls6 valley cover for this issue

what ports are you talking about in the valve covers as my lm7 only has a oil fill hole

if i was to rig up a catch can how would i plum it

any pics or diagrams you guys can share

lemkerailroad

i also hear that you can modify the valley for a pcv system ???????

does this help ??????