I was wondering what others are using and recommending for their high boost LT1 motors. The last time I had the intake off, I used some Felpro 1284 gaskets. I started having an issue with my crankcase being pressurized. Yesterday I took off the intake, and noticed the gaskets were damaged around several of the ports, as in slightly ripped, as pressure was pussing them out or something. I think that boost from the intake runners was leaking into my crankcase, and causing my problems.

What gaskets do you guys recommend when I put the intake back on. The motor will see around 20lbs of boost.

 

20 PSI boost divided by a .060" thick gasket is barely nothing in terms of actual pressure trying to push at the gasket. Just spray some coppercoat on them and torque your intake properly. I use the LT4 gaskets. If your heads are cut and your intake doesn't fit, that's a different situation.

 

Fel pro. Re torque 2nd time after 24 hours of relax. Also, I like the 1074 head gaskets. 97ss 383-D1 MM6.

 

Thanks guys. I'm going to use the 1284 again, and see how it goes.