Trying to help a buddy prep a SBE 6.0 turbo setup.

He bought what he thought were Felpro .052" gaskets, but either Summit messed up, or he misunderstood, and ended up with the .041".

With the typical LS pistons .007 out of the hole this leaves us with a Quench of .034".

Too tight?

Ron

 

I am running 0.040" Cometics as I think a lot of other guys are as well. Can't remember my out of the hole numbers, might have been a tad smaller but they were certainly above the surface. No problems here.

 

I've heard for a turbo quench is not as important and usually people go with around stock value with that. Unless you're on a time crunch, I would get the right parts.

 

I'm running .041" felpro MLS and very happy. Personally I feel throttle response was better vs the stock head gaskets

 

In a word.......no.

KW

 

After a little research, I agree.
Added bonus is that when turbocharged, it won't need to run past 6500 rpm.
Being a dished piston engine, quench is prob less important. No flat on the piston.

We will go with them.

Thanks guys.

 

Maybe. A tight quench will make the engine a bit more efficient, turbo and NA. A forced induction engine is less sensitive than NA, but it still matters. People who are building "low" rpm street engines will tighten the quench for more low end torque and efficiency. Helps prevent detonation at higher cylinder pressures, too.

the concern is that at high rpm's the rods and crank can stretch, and the quench gets smaller. If things stretch too much, the pistons will contact the heads.

If you're using stock rods and crank with some miles/abuse on them, you might be on the ragged edge. If you're using new quality forged parts, you're fine.