> Anyone know what the part number of the removable > EPROM ECM is for the Northstar engines? 94 I think. Hi Terry, 16180517, 16196402 & 16197429 All cross reference to each other as long as PROM is removed, they are considered same.. Possible donors are 93 Allante, 95 AuroraCadillac 94-95, 93-95 Eldo 4.6, 93-95 Seville 4.6 HTH's Mike V