Generally speaking...at what psi do these heads begin lifting from the blocks? Are they all four bolts per cylinder?

Is the LSX block the only one that can handle 2o+ psi w/o pushing water?

 

With fresh head gaskets I start to push a lil water around 22 psi. With agressive timing and 20 psi. Push a lil after the gaskets have been on there a while.

Read the ohio boys thread in this section and theres some good info in there.

Kyle

 

thanks kyle. Are you running a 370?

 

I was running a 370..... A few more cubes with the new motor

 

I'm running an LS6 block + Allpro heads, I'm on my second set of head gaskets for this shortblock for the last 3 years. I have not made a ton of passes but it's never gotten jacked up.