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 Codes	Cylinders	CID	HP	Comp. Ratio	Carb	Trans
WC	8	350	265	9.2:1	2bbl	Manual
WH	8	400	345	10.75:1	4bbl	Manual
WK	8	350	325	10.5:1	4bbl
WM	8	350	265	9.2:1	2bbl	Manual
WN	8	350	325	10.5:1	4bbl	Manual
WQ	8	400	335	10.75:1	4bbl	Manual
WZ	8	400	330	10.75:1	4bbl	Manual
XB	8	350	265	9.2:1	2bbl	Automatic
XC	8	350	325	10.5:1	4bbl	Automatic
XD	8	350	325	10.5:1	4bbl
XL	8	350	265	9.2:1	2bbl	Automatic
XN	8	400	345	10.75:1	4bbl	Automatic
YE	8	350	265	9.2:1	2bbl	Automatic
YJ	8	350	265	9.2:1	2bbl	Automatic
YT	8	400	330	10.75:1	4bbl	Automatic
YW	8	400	335	10.75:1	4bbl	Automatic
ZC	6	250	175	9.0:1	1bbl	Manual
ZD	6	250	230	10.5:1	4bbl	Manual
ZE	6	250	215	10.5:1	4bbl	Automatic
ZF	6	250	175	9.0:1	1bbl	Automatic
ZH	6	250	230	10.5:1	4bbl	Manual
ZK	6	250	175	9.0:1	1bbl	Manual
ZL	6	250	215	10.5:1	4bbl	Automatic
ZN	6	250	175	9.0:1	1bbl	Automatic

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