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. On the 6 cylinder engines the code is located on the cylinder block below the spark plugs.

Engine Numbers
123456	Motor Unit Number
WQ	Engine Type Code
28L 100001	Engine Vin Code
Engine Vin Code:
2	Pontiac Division
8	Model year
L	Assembly Plant
100001	Last six digits VIN

Engine Codes	Cylinders	CID	HP	Comp. Ratio	Carb	Trans
WI	8	400	335	10.75:1	4bbl	Manual
WU	8	400	340	10.75:1	4bbl	Manual
WZ	8	400	335	10.75:1	4bbl	Manual
YM	8	350	320	10.5:1	4bbl	Automatic
YT	8	400	330	10.75:1	4bbl	Automatic
ZD	6	250	215	10.5:1	4bbl	Manual
ZN	6	250	175	9.0:1	1bbl	Automatic
WC	8	350	265	9.2:1	2bbl	Manual
WK	8	350	320	10.5:1	4bbl	Manual
WQ	8	400	335	10.75:1	4bbl	Manual
YT	8	400	330	10.75:1	4bbl	Automatic
ZE	6	250	215	10.5:1	4bbl	Automatic
ZK	6	250	175	9.0:1	1bbl	Manual
YJ	8	350	265	9.2:1	2bbl	Automatic
YW	8	400	335	10.75:1	4bbl	Automatic
XN	8	400	335	10.75:1	4bbl	Automatic
XT	8	400	340	10.75:1	4bbl	Automatic

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