4.3L CARB ALPHA/BRAVO [0M615000 THRU 0W300012] - Cat.# 90-884714 [0W300013 THRU 0W309999] - Cat.# 90-884714001 [0W310000 THRU 0W649999] - Cat.# 90-884714002 [0W650000 THRU 1A063239] - Cat.# 90-884714003 [1A063240 & Up] - Cat.# 90-884714004