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Will a 98 Cadillac STS Northstar motor go into 02 STS?

No, a 1998 Cadillac STS Northstar engine will not directly bolt into a 2002 Cadillac STS. While both are Northstars, the engine and associated components changed significantly between those model years. The engine mounts, wiring harnesses, and computer systems are incompatible. You'd need a massive amount of custom fabrication and potentially a significant amount of electrical re-work, making it a practically infeasible swap.