LS1 to LS3 MAP adapter?
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the LS3 MAP is different the the Ls1/2/6. You can use your original LS1 MAP sensor, but you'll have to put a larger o-ring so it'll seal, since the LS3 has a larger hole. Also, the internals on the LS3 MAP are different, that is why it won't plug in. So, you'll need a LS1/2/6 MAP sensor, and an o-ring to seal it. Hope this helps.