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Engine Unit Number

See 1968 Engine data. 

Engine Code Displ. & Carb. Comp. Ratio
VA, VB, VE, VF 250" 6 1 Bbl. (1) 8.5:1
QA, QB, QI, QJ 350" V8 2 Bbl. (2) 9.0:1
TB, TC, TD, TL 350" V8 4 Bbl. (2) 10.25:1
QN, QP, QV 350" V8 4 Bbl. (2) 10.5:1
QX 350" V8 4 Bbl. (2) 10.5:1
QR, QS, QW 400" V8 4 Bbl. (2) 10.25:1
QT, QU 400" V8 4 Bbl. (2) 10.5:1
UC, UD, UJ 455" V8 2 Bbl. (2) 9.0:1
UN, UO, UL 455" V8 4 Bbl. (2) 10.25:1
US, UT, UV, UW 455" V8 4 Bbl. (2) 10.25:1
(1) Export Ratio 7.25:1.
(2) Export Ratio 8.3:1.
Fig 1: 1968-73 V8 ENGINES UNIT NUMBER LOCATION
G09340431Courtesy of GENERAL MOTORS COMPANY