Which head gasket (bore size)

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Jun 22, 2009 | 11:18 AM

Hilton

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Tough Mudder

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From: Shreveport, LA

Which head gasket (bore size)

I've read a good bit, but I can't seem to find a conclusive answer to my question.

I've got an LQ4 block that I'm putting TrickFlow CNC 215 heads on. I understand that I'm supposed to match the head gasket to the block. The block, as I understand it, has a 4" bore. I've read, however, that I'm not to use the 6.0 liter head gaskets, that I need a head gasket with a bore of 4.030. I've also seen in other threads that I need specifically the LS7 head gaskets.

Thanks in advance.
Hilton

Jun 22, 2009 | 11:52 AM

bww3588

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From: Chillicothe/Lima, Ohio

the correct size for head gaskets according to Jon at TSP, is 4.085 for a 6.0 block bored .030 over.

Jun 22, 2009 | 12:07 PM

XtraCajunSS

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From: Baton Rouge, LA, USA

Just use the the GM 6.0/6.2 mls gaskets (PN 12610046.) They have more than enough bore clearance for you. And for what its worth, matching the head gasket to the chamber of the head is just as critical. The gasket bore diameter needs to be at least as large as both the bore AND the chamber. If the gasket hangs over into the bore or the chamber you will have trouble. We have them in stock.

Thanks!
Shane