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lol, well its still a ls1, the ls6 is really made that by the cam and heads. Some people claim a few LS1 blocks didnt have that mark either, but it does seem to be the largest external difference, The only way to be 100% positive it to pull the pan and check for the bay-to bay "windows" under the cylinders.
Just in 01-02 all ls1's got the LS6 intake manifold, and M6s got the LS6 clutch.
my last 6 digits are 108716, maybe ours were side by side, lol
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