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5.7 head gaskets have a right and left side
6.1 head gaskets use the same gasket

now, put a 5.7 eagle head on a 6.1, what head gasket do you use?

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I'm thinking the 6.1 because of the bore but why does the 5.7 use a left and right?
Is it because the 6.1 doesn't use the EGR?

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IDK! i have yet to figure out why they would make a right and left head

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the 5.7 has a right & left head because an egr passage runs thru the front of the head on the right side.

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