Stephen,

If I remember correctly, the 2.5 "U" engine was used in the "N-body" carline...Qlds Calais/Buick Somerset Regal/Pontiac Grand Am. The 2.5 "R" engine fit the "A-body" carline...Chev Celebrity/Olds Cierra/Buick Century/Pontiac 6000. The S-10 used a 2.... Login to read more.