LS1 Engine

Is there any way to tell what year car a LS1 engine came out of by any numbers on the block etc? Thanks.

This info came off of the MorTec webpage:

12550592...350...97-up...crossbolted block, Gen.III, "LS1", aluminum
12559378...350...99-up...crossbolted block, Gen.III, "LS1", aluminum
12559846...350...98-up...crossbolted block, Gen.III, "LS1", aluminum
12560621...350...98-up...crossbolted block, Gen.III, "LS1", aluminum
12560626...350...99-up...crossbolted block, Gen.III, "LS1", aluminum
12560629...350...99......crossbolted block, Gen.III, "LS1", aluminum
12561168...350...01-up...crossbolted block, Gen.III, "LS1", aluminum
12562174...350...98-up...crossbolted block, Gen.III, "LS1", aluminum

Not really year specific :shrug:.

yes, i was on that site this morning and also came to that conclusion...I'm gonna have to get some numbers and see what i can come up with...maybe narrow it down a bit..Thanks

It's hard to do because sometimes towards the end of a model run GM would change over to the next years spec parts rather then running another batch of old parts.
Case in point my 00 Formy which I ordered in March of 00 has an LS6 style block (not a real LS6 block according to the part numbers) and 241 heads which weren't supposed to be on 00s, just 01 and up.