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LS3 versus LS7 Head Gaskets

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Old May 8, 2017 | 10:35 PM
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Default LS3 versus LS7 Head Gaskets

Besides the bore size, what are (if any) the differences between the LS3 and the LS7 head gaskets?

Thanks!

KW
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Old May 8, 2017 | 10:45 PM
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Coolant passages are different. Im trying to recall if it is due to the block or head, but i do know they shouldnt be used on an ls3 engine even overlooking their bore size diff.
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Old May 9, 2017 | 08:44 AM
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I've read the LS7's are different but I honestly can't see it.



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Old May 9, 2017 | 09:42 AM
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The little steam holes are moved out a little to accommodate the bigger bore. The top ones you will see are moved up/in a little. Also the lower ones are moved down a little but are less noticable. Also holes in the back are a little different as the head holes are moved over for the bigger bore. I had to figure this all out as I have an ERL block which has a LS2 base but and LS7 head. The block holes are about the same in each it is the head that is the driver when picking out a gasket.
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Old May 9, 2017 | 10:23 PM
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Thanks guys.

The reason I ask is that I have a line on a new set of TFS LS7 heads. Just need to sort out the little detail before I ****** them up.

They'd be going on my 429ci LS3.

I guess I REALLY should've asked "which head gasket" to go with; LS3 or LS7.....

Originally Posted by KCS
I've read the LS7's are different but I honestly can't see it.
Yeah.....darn near identical.

KW
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