Caveman

iTrader: (2)

What is the thickness of an LS7 head gasket .055 anyone know??

ramairws6

iTrader: (33)

If I'm not mistaken it's .054 thou. Traver

Caveman

iTrader: (2)

Ok , I was close. Thanks

edcmat-l1

iTrader: (10)

Pretty sure the compressed thickness is .051

hirdlej

iTrader: (31)

It's .053

Brian Tooley Racing

iTrader: (13)

I know the cooling holes in the LS7 head gaskets don't line up with the cooling holes on a 6.0L iron block...

Stang's Bane

iTrader: (22)

Do you know if they line up on a ls1 block??

MY99TAWS6

iTrader: (3)

So this means you can't use the ls7 head gaskets on a 6.0 iron build up???? Someone please tell me if they are using them with afr 225 72cc heads on their iron build up.

veee8

iTrader: (40)

????? I was told to use the LS7's on mine????? What is the mismatch?

69LT1Bird

iTrader: (1)

This is from the blueprints:

1.33 mm (.052) operating thickness (compressed thickness)

Bore is 105.5 mm (4.15")

Deeavi

iTrader: (16)

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"

red83

iTrader: (64)

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

Caveman

iTrader: (2)

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.

edcmat-l1

iTrader: (10)

Dammit off by a thou........LOL

veee8

iTrader: (40)

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.

Deeavi

iTrader: (16)

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.

Deeavi

iTrader: (16)

I believe the iron blocks are the same configuration as the Aluminum blocks. I am not sure why they told you to use the LS7 gasket, but I guess they had a good reason. Maybe the size, 4.150" bore. The LS1 block water jackets holes are a little bigger than in the LS7 block, so I would think your gaskets would be OK.

veee8

iTrader: (40)

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.

TJ

iTrader: (10)

i was told by trick flow to use an ls7 gasket on my iron block, but others say not too.
im a lil confused on the whole deal.
?

veee8

iTrader: (40)

Well I am using them right now. 4.030" 6.0L iron block and L92 heads.