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Engine Code Location

Engine Code is stamped on right side of engine block, directly to rear of distributor on all 6-cylinder engines. V8 engines are identified by a code tape installed directly above unit number, which is stamped on engine oil fill tube.

Engine Code Letters
250" 6-Cyl. 1-Bbl. CCC, CCA, CCB, CCD
350" V8 4-Bbl. QW, QB, QC, QL, QQ QU, TB, TC, TL, TO
455" V8 4-Bbl. UL, UU, UX, UA, UC, UD UB, UN, UR, UO, UP, VL VA, VC, VB, VD, VO, VP
Fig 1: 1973-74 6 CYL. ENGINE CODE LOCATION
G09340433Courtesy of GENERAL MOTORS COMPANY
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