What casting # are those?

 

Forgot to show the blown head gasket carnage...

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The Gasket was ripped right where the coolant was coming in ...
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#862...

 

I can't believe no one has used LS9 gaskets with 862 heads, or at least ran into the same issue. Maybe post/search on tech?

 

You cannot run any MLS gasket if you have the notch on your heads, including the LS9 gaskets. If your heads do have the notch, you must run composition gaskets.

The good news is, used heads are cheap. And now is the time, since it's apart. You really do want to use MLS gaskets if you plan on using FI later on. But if you're never gonna use a power adder, the composition gaskets will be just fine.

 

Do certain casting #'s have the notch, or is it hit and miss?

 

Does anybody know if the 706 heads have the same flow numbers as the 862 heads? I've got a guy that might be willing to trade me for my 862 but I just wanted to make sure before I traded him. They should bolt right up right?
The reason being so I can order the better LS9 gasket because I plan on boosting.

Thanks

 

How can I tell if the 706 heads are from castech?

 

.......

 

Well some goodies have arrived the stage 2 turbo kit from Tricks with free upgrade to 72mm turbo is here. Thanks Tricks for a very nice kit and thanks Bigschwerm for the great deal. Also the 60# injectors have arrived once again thanks Bigschwerm and some of the gaskets.

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