adrenalinejunkie636

I have an 02 z28 and had the motor completely rebuilt with new rods/pistons, ls7 lifters, ported 5.3 heads, 228r cam, etc. Now when you get on it about 3/4k its leaking oil pretty bad and gets worse with rpm. I put 5 qts in it just with a partial dyno tune. Its coming from above the started. What could have been done wrong with the shortblock that could cause it to build too much pressure? Not sure that is the problem yet but trying to get ideas.

99Bluz28

iTrader: (35)

If it not coming from up top I'd say pull the transmission back out. It's either the rear main seal leaking or the rear cover.

adrenalinejunkie636

Its coming from the upper rear. He already redid the main seal and wasn't it. I have heard a few options as to what it may be but my main concern is it being something faulty with the shortblock.

tsheehan

iTrader: (1)

I have seen the cam seal get jacked up and leak on a new engine. That looked ok?
Whats it making for pressure at idle? A bod leak should throw of your sending unit if its on the top?

Jeff Smith

iTrader: (44)

Had experience with rebuilt ls1.Found out that bottom of head driver side minor leaked when high rpm..

blue00ZZleeper

iTrader: (5)

Are all the block plugs and the rear barbell installed properly?