hey vorra racers

I have a problem with my ls1 motor and I'm hoping somebody has been down this rod. I keep on building crank pressure and it is causing oil to blow out my rear main seal. I have replaced my piston rings and also vented the motor out the vavle covers on each side. I have been recommended to put a vacuum pump on the motor I just don't know if this is the solution. So if anyone has any solution to this problem it would be greatly appreciated.

steve

Too much pressure on the bottom end. Have you replaced the rear main seal? If not, that may be part of the problem. Second are you sure the breathcaps you put on are working? Friend had a problem with his being clogged up and blew out all kinds of oil everywhere. If all else fails, go to a local speed shop and talk to a builder and see if he has any solutions.