Pontiac stamped a variety of codes on the front of the engine block. The first code, located near the passenger side cylinder head, is the motor unit number This number was stamped at the engine assembly plant and it has no correlation to the Vehicle Identification Number. Just below that is the two-digit engine type code. A few inches farther down, near the timing chain cover is a code identifying teh Pontiac division of General Motors, the model year, the vehicle assembly plant, and the last six digits of the VIN number. This code was not added until late in the 1967 production year On the 6 cylinder engines the code is located on teh cylinder block below the spark plugs.

Engine Numbers
123456	Motor Unit Number
WQ	Engine Type Code
27L 100001	Engine Vin Code
Engine Vin Code:
2	Pontiac Division
7	Model year
L	Assembly Plant
100001	Last six digits VIN

Engine code	Cyl	CID	HP	Comp Ratio	Carb	Trans
WI	8	400	325	10.75:1	4bbl	Manual
WC	8	326	250	9.2:1	2bbl	Manual
WH	8	326	250	9.2:1	2bbl	Manual
WK	8	326	285	10.5:0	4bbl	Manual
WO	8	326	285	10.5:0	4bbl	Manual
WQ	8	400	325	10.75:1	4bbl	Manual
WU	8	400	325	10.75:1	4bbl	Manual
WZ	8	400	325	10.75:1	4bbl	Manual
XI	8	326	250	9.2:1	2bbl	Automatic
XN	8	400	325	10.75:1	4bbl	Automatic
XO	8	326	285	10.5:1	4bbl	Automatic
YJ	8	326	250	9.2:1	2bbl	Automatic
YM	8	326	285	10.5:1	4bbl	Automatic
YT	8	400	325	10.75:1	4bbl	Automatic
ZD	6	230	215	10.5:1	4bbl	3sp/man
ZE	6	230	215	10.5:1	4bbl	Automatic
ZF	6	230	155	7.6:1	1bbl	3sp/man
ZG	6	230	155	7.6:1	1bbl	Automatic
ZK	6	230	165	9.0:1	1bbl	3sp/man
ZL	6	230	215	10.5:1	4bbl	Automatic
Z	6	230	165	9.0:1	1bbl	Automatic
ZN	6	230	165	9.0:1	1bbl	Automatic
ZR	6	230	215	10.5:1	4bbl	Manual
ZS	6	230	165	9.0:1	1bbl	3sp/man

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This Home Page was created Thursday, April 10, 1997
Most recent revision Friday, January, 31th, 2003