blue by you

iTrader: (5)

I am in the process of building an L92 headed 408 (.030" over LQ block) and am not sure which head gasket to run? The L92 head gasket is for a 4.065 bore but I'm not sure of the compressed thickness. I was just going to run the LQ4/9 head gasket which is .051" compressed. I need something close to that to keep my CR of about 11.3 and my quench around .045". I don't want to spend the money on Cometics if I don't have to and I get a hell of a deal with factory parts, so I'd like to stick to Genuine GM if possible. If you guys could help me out with part numbers, bore sizes and compressed thickness of several gaskets, that would be great! Thanks.

Jon@Texas-Speed

iTrader: (18)

You could probably go with a GM MLS 6.0L head gasket. I believe they are ~4.040" bore size. Should be a compressed thickness of .054" or so. They will probably work fine for you. Part Number 12589227. We have them on the shelf if you need a pair!

Jon

blue by you

iTrader: (5)

Wouldn't it be better to use an L92 head gasket with an L92 head? I think they are 4.065"

Demonhawk01

thats what i would think

69LT1Bird

iTrader: (1)

Compressed thickness is 1.33 mm, or .052" for the L92 and all others except the LS9. This is from the blueprints.

Jon@Texas-Speed

iTrader: (18)

Yeah I didn't think about the L92 heads. Here's the Part Number: 12610046

blue by you

iTrader: (5)

Alright-thanks guys!

Mighty-SS

iTrader: (19)

Use L92 Gaskets !!! That's a sweet setup, let us know some # when you are done


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blue by you

iTrader: (5)

Of course I will! I'm curious to see what she puts down for power too. Any estimates?

02 BLK WS6

iTrader: (11)

Is the piston in the hole or out?

blue by you

iTrader: (5)

It will end up being .005" out after the block is decked to 9.230".

blue by you

iTrader: (5)

Just had PatG spec me a cam-239/247, .624"/.624, 115+4. So we'll see what it'll do this summer when I get it in! Anybody have a power estimates/guesses for the hell of it??