it should have a GM id tag on the block near where the fuel pump boss would be. All 502's will also have 8.2L stamped on the block. ZZ502's run alum cylinder heads (part #12363390) where HT's run iron heads. As far as internals go, the cam is different and without removing it and having someone calculate the lope seperation and lift you wouldnt be able to tell by just looking at it. Hope this helps.
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