4.3L (GEN +) (4BBL) Reman - 1G400000 & Up

4.3L CARB ALPHA/BRAVO - 0W650000 THRU 1A063239

4.3L CARB ALPHA/BRAVO - 1A063240 & Up

4.3L MPI ALPHA/BRAVO - 0M615000 THRU 0W309999

4.3L MPI ALPHA/BRAVO - 0W310000 THRU 0W649999

4.3L MPI ALPHA/BRAVO - 0W650000 THRU 0W658582

4.3L MPI ALPHA/BRAVO - 0W658583 THRU 0W658583

4.3L MPI ALPHA/BRAVO - 0W658584 THRU 1A030367

4.3L MPI ALPHA/BRAVO - 1A030368 THRU 1A030369

4.3L MPI ALPHA/BRAVO - 1A030370 THRU 1A063239

4.3L MPI ALPHA/BRAVO - 1A063240 & Up

4.3L MPI ALPHA/BRAVO - 0M300000 THRU 0M614999

4.3L MPI ALPHA/BRAVO EC - 1A637496 & Up