how do i know if i have an LS1 or an LS6
#2
TECH Senior Member
Your engine is an LS1, and possibly has an LS6 intake manifold and/or an LS6 block.
LS6 intake manifold from the factory says 12561184 on the driver side.
LS6 engine block says 12561168 on the rear of the driver side of block.
LS6 intake manifold from the factory says 12561184 on the driver side.
LS6 engine block says 12561168 on the rear of the driver side of block.
#5
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They started phasing the LS1 blocks out late in 4th gen production. I believe a few 01s and about 25% of 02s got the LS6 block. Cars could also have it if they had an engine replaced under warranty. Heads stayed the same, but the blocks themselves could be either or in the last 2 years. To know for sure check the block number on the rear driver side of the block. You would need a mirror to see it.