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Help quick ls6 intake #

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Old 06-19-2011, 04:31 PM
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Default Help quick ls6 intake #

looking at a local sale on an ls6 intake, the casting number is supposedly "1256H84"

That correct?
Old 06-19-2011, 04:38 PM
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there are many PN for a LS6 mani......easy way to check it is see if the bottom is flat......LS1 mani has a curve in it.......also make sure that there are the brass threaded inserts in all the bolt holes.....some do not have all the inserts
Old 06-19-2011, 04:45 PM
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Thank you! ^
Old 06-19-2011, 05:21 PM
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The old LS1 intake with the EGR setup is 12560688.

The Stock 2001-2002 F-body LS6 is 12561184.

The Z06 LS6 is 12573572.

These are the numbers stamped on the manifold


Info taken from another ls1tech thread.
Old 06-19-2011, 05:22 PM
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So it looks like its the right numbers, just the H, which is really a 11.
Old 06-19-2011, 05:51 PM
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Originally Posted by Chevycrew
So it looks like its the right numbers, just the H, which is really a 11.
i just figured this out lol, thanks tho guys
Old 06-20-2011, 12:44 PM
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Originally Posted by sjsingle1
there are many PN for a LS6 mani......easy way to check it is see if the bottom is flat......LS1 mani has a curve in it.......also make sure that there are the brass threaded inserts in all the bolt holes.....some do not have all the inserts
Exactly.....




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