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LS6 Head Swap to a LQ4 6.0

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Old 05-01-2007, 09:54 PM
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Arrow LS6 Head Swap to a LQ4 6.0

Has anyone swapped LS6 Heads onto a LQ4 6.0 Vortec Truck engine? I picked up a set and wondered how these would work for raising compression etc. Any help would be appreciatted!
Old 05-02-2007, 09:13 AM
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the lq4 heads would need to be milled to raise compression
Old 05-02-2007, 09:23 AM
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Originally Posted by CATDIESEL
the lq4 heads would need to be milled to raise compression
I don't know what the cc's are for the LQ4 heads. The LS6 heads are 65cc. Mill them with a thinner head gasket and it should raise it quite a bit.

Once you know the LQ4 cc's you can get one of the calculators and figure out what the changes would be.

Bob K.
Old 05-02-2007, 09:28 AM
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Ls6 "64cc" heads bump the compression up on a LQ4 from 9.4 to around 10.14 with a stock gasket and 10.4 with a .040 gasket.
Old 05-02-2007, 06:07 PM
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Thanks all! Sorry for the duplicate post.




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