What bore head gasket are you guys using on the Dart cylinder heads??? It seems to have an unusually large diameter combustion chamber. I ordered some MLS gaskets from SDPC and they sent me Graphite ones by mistake and they are nowhere near large enough diameter.

 

I used the 6.0 MLS GM head gasket.

 

vettenuts, you have a PM.

 

What's the compressed thickness on those gaskets?

Ben T.

 

Everything I've read about them says .060". The graphites are approximately .048" to .050".

 

I used the felpro 4.135 x .041's. Think felpro's pn# is 1041. No problems with 62cc heads and stock bottom end with Dart 225s.

 

The chamer is only 3.950. It isnt that big. Any gasket for a 4.0-4.040 bore will be fine.

 

The graphite gaskets that I mistakenly recieved from SDPC seem to have the head gasket bores not where they're supposed to be. It's almost as if the tooling used to stamp the gasket wasn't locating the gasket properly when it was stamped. The two outermost cylinders have gasket protruding into the combustion chamber, whereas the two center ones are perfectly aligned.

 

Sent you back a PM, but in a nutshell the 6.0's fit fine. I think the compressed thickness is either 0.051 or 0.054. That might come up in a search. I can also pull the part number when I get home tonight if you need it. I kept my old head gaskets in the plastics the new ones came in. (Yeah, don't remind me I am a major pack rat )

 

Me too.. Worked perfect
I measured them with a mic. and got about .054. Not sure what they would be compressed.

 

Part number I used was 12589227.

This is some information that was provided to me on my search when I was trying to figure out what to do, I think the person who provided the information also worked for GM:


2006 Corvette LS2 head gasket p/n 12589227 per GM drawing.

Bore diameter 102.6 mm (4.039 in) per drawing.

Operating thickness 1.33 mm (.052 in) per drawing.