How thick is an LS7 head gasket??
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I did a good bit of research on this matter. The LS7 head Gaskets are made to work with the LS7 Block, and are compatible with all LS1, LS6, LS2, and LS7 style heads. The water jacket holes above the cylinders in the LS7 block are shaped just a little different than the the LS1 style blocks. I tried LS1 style gaskets (Cometic) on my LS7 block and found that the water jacket holes above each cylinder were just a little obstructed - Check it out for yourself! Go to the Cometic site and they have pictures of each gasket.
According to the GMPP catalog compressed thickness is listed as .053"
According to the GMPP catalog compressed thickness is listed as .053"
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I did a good bit of research on this matter. The LS7 head Gaskets are made to work with the LS7 Block, and are compatible with all LS1, LS6, LS2, and LS7 style heads. The water jacket holes above the cylinders in the LS7 block are shaped just a little different than the the LS1 style blocks. I tried LS1 style gaskets (Cometic) on my LS7 block and found that the water jacket holes above each cylinder were just a little obstructed - Check it out for yourself! Go to the Cometic site and they have pictures of each gasket.
According to the GMPP catalog compressed thickness is listed as .053"
According to the GMPP catalog compressed thickness is listed as .053"
here is a pic of my ls7 gm gasket
here is a link to some pics of 6.0/6.2l gaskets see post 20
https://ls1tech.com/forums/showthrea...skets+head+ls7
Last edited by red83; May 1, 2008 at 06:44 AM.
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I am using GM LS7 head gaskets on my Red Formula with AFR 225/ 72cc, it has an MTI sleeved LS6 block w/4.100 bore. I've had those head gaskets on for about 1 1/2 years and probably over 100 runs but I'm thinking its about time for new head gaskets on a boosted motor.
Are the water jackets any different on the iron block, compared to the aluminum LS1/6? I could see there being a slight difference using a LS1 gasket on a LS7 block, but what about the other way? I know if there would have been a major mismatch, I would not have proceeded with putting the heads on, but nothing is jumping out at me. I was recommended to use the LS7's with my stage 2 L92's from Rich @WCCH. So thats what I got.
the gaskets look familiar according to there website. (i do see what jackets you are talking about on the left side of the gasket). but if you flip one gaskets over they are identical.
here is a pic of my ls7 gm gasket
here is a link to some pics of 6.0/6.2l gaskets see post 20
https://ls1tech.com/forums/showthrea...skets+head+ls7
here is a pic of my ls7 gm gasket
here is a link to some pics of 6.0/6.2l gaskets see post 20
https://ls1tech.com/forums/showthrea...skets+head+ls7
They are not identical. Call Cometic and ask them. I did twice! The spacing of the water jacket holes (2 holes on top of each cylinder) in the block are different from an LS1- because of the siamese bores.
Are the water jackets any different on the iron block, compared to the aluminum LS1/6? I could see there being a slight difference using a LS1 gasket on a LS7 block, but what about the other way? I know if there would have been a major mismatch, I would not have proceeded with putting the heads on, but nothing is jumping out at me. I was recommended to use the LS7's with my stage 2 L92's from Rich @WCCH. So thats what I got.
Yeah the bigger bore of the gasket to help unshroud the valves for better flow. I could see trying to use the LS1 gaskets on the LS7 block causing a problem because of the siamese like you said, but vice versa, I didn't notice any conflicts. Just trying to be sure. Thanks.
