Pontiac engine codes
1964 - 1979
Pontiac Engine Codes
Bold Type is for manual transmissionStarting in '73,2nd HP # is for Dual Exhaust
1964
326
250 HP
92x,96-0
326
280 HP
94x,97-0
389
230 HP
04L,05L,08R,09R
389
235 HP
22B
389
267 HP
389
283 HP
10A
389
303 HP
25K,26K,27P,28P
389
306
23B,29N
389
325
78X,79J
389
330
32B,34N,33-6
389
348
76X,77J
421
320
35B,38S,43N
421
350
44B,47S,49N
1965
326
250
WP,ZN
326
285
WR,YP
389
256
WA,WB,YA,YB
389
290
WC,YC,YD
389
325
YE,YF
389
333
WE
389
335
WT,YS
389
338
WF,YG
389
360
WS,YR
421
338 HP
WG,YH
421
356
WH,YJ
421
376
WJ,YK
1966
326
250
WP,WX,YN,XF
326
285
WR,YP,XG
389
256
WA,WB,YA
389
290
WC,YV,YU,YC,YD
389
325
YX,YL,YW,YF,YE
389
333
WE
389
335
WW,WT,YS,XE
389
360
WV,WS,XS,YR
1967
326
250 HP
WP,WX,WC,WH
326
250 HP
YO,YN,XF,YJ,XI
326
285 HP
WR,XR,WK,WD
326
285 HP
YP,XG,YM,XO
400
255 HP
XL,XM
400
260 HP
400
265 HP
WA,WB
400
265 HP
YA,YB,YC,YD
400
290 HP
XV,XU
400
293 HP
XC
400
325 HP
WU,WZ,WQ,WI
400
325 HP
YE,YF,YT,XE,XN,XW,XX
400
333 HP
WD,WE,WY,XT
400
335 HP
WT,WW,YS
400
350 HP
XZ,XY,XH,XJ
400
360 HP
WS,WV,WR,XS,YZ,XP
428
360 HP
WG,Y2,YY
428
376 HP
WJ,XK,Y3,YH,Yk
1968
350
265 HP
WD,WC,YN,YJ
350
320 HP
WR,WK,YP,YM
400
265 HP
XM,YA
400
290 HP
WA,WB,YC
400
330 HP
400
335 HP
WQ,WZ,WI,XN
400
340 HP
WU,XT
400
350 HP
XZ,XH,YS,YZ
400
360 HP
WT,WS,XS,XP
400
366 HP
WY,XW
428
375 HP
WG,YH
428
390 HP
WJ,YK
1969
350
265 HP
WC,WP,WM,WU
350
265 HP
XL,YJ,XR,YN,XB,YE,YU,XS
350
325 HP
WK,WN,XC,XD
350
330 HP
WR,WV,XT,XU,YP
400
265 HP
XM,YZ,XX,YB,YF
400
290 HP
WA,WB,WD,WE,YC,YD
400
330 HP
WZ,YT
400
335 HP
WQ,YW
400
340 HP
400
345 HP
WH,XN
400
350 HP
WT,WX,YS,XH
400
366 HP
WS,YZ
400
370 HP
WW,XP
400
375 HP
WI,WY,XY,XW
428
360 HP
WG,YL,YH,XE,XJ
428
370 HP
WF,XF
428
390 HP
WJ,WL,YK,XG
1970
350
255 HP
W7,WU,X7,YU
400
265 HP
400
290 HP
WE,YD
400
330 HP
400
350 HP
WX,WT,XH,YS
400
366
WS,YZ
400
370
WW,WH,XP,XN
455
360 HP
WA,YC,YH
455
370 HP
WG,XF
1971
350
250 HP
WR,WU,WN,WP
350
250 HP
XR,YU,YN,YP
400
265 HP
WS,WX,XX,YX
400
300 HP
WK,WT,YS
455
280 HP
WG,YG
455
325 HP
WJ,YC
455
335 HP
WL,WC,YE
1972
350
160 HP
WR,YU,YV,YR
400
200 HP
YX,YZ,ZR,ZV,ZX
400
250 HP
WK,WS,YS,YT,ZS
455
200 HP
455
220 HP
YA,YC,Y4
455
300
WD,WM,YB,YE
1973
350
150,175 HP
XR,WV,ZB,ZD
350
150,175 HP
Y2,Y7,YR,YV,ZR,ZV
350
150,175 HP
WA,WC,WD,WF,WL,WN,XZ
400
170,185 HP
W5,XH,XI,X3,X4
400
170,185 HP
YI,YP,YX,YZ,Y4,ZK,ZX
400
200,230 HP
WK,WS,WP,YN,YX,YT
400
200,230 HP
Y3,ZN,ZS,XK,XN,XX
400
200,230 HP
XZ,X5,YF,YG,Y6
455
215,250 HP
WT,WW,ZZ,ZE,YA,YC
455
215,250 HP
YD,YK,ZA,AC,XA,XE,XJ
455
215,250 HP
XL,XY,XT,X7,XO,YE
455
290
ZJ,XD
455
310
Z8,X8
1974
350
155,170 HP
WA,WB,AA,YA,ZA
350
155,170 HP
YB,YC,ZB,YN,YP,YS
350
170,200 HP
WN,WP,ZP,YN,YP,YS
400
175,190 HP
AH,YH,YJ,ZH,ZJ
400
175,190 HP
AD,YF,YK,ZD,ZK
400
200,225 HP
WT,WR,Y3,AT,YT
400
200,225 HP
YZ,ZT,AD,YL,YM,ZS
455
215,250 HP
AU,YR,YU,YW,YX
455
215,250 HP
YY,ZU,ZW,ZX,A4
455
215,250 HP
455
290 HP
W8,Y8
1975
350
155 HP
YB,YA
350
175 HP
WN,YN,ZP
400
170 HP
400
185 HP
WT,YS,YT,ZT,YM
455
200 HP
WX,YU,YW,ZU,ZW
1976
350
160 HP (Early)
YB,YA,YP,YR,ZX
350
160 HP (Late)
XM,XP,XU,XR,XW,XX,X3,ZF,ZH
350
165 HP
400
170 HP (Early)
YJ,YC
400
170 HP (Late)
X9,X4,XT,XY,XS,XZ,X8
400
185 HP (Early)
WT,Y6,Y7,YS,YT,YY,YZ,ZA,ZK
400
185 HP (Late)
WY,X7,ZJ,ZL,X6
455
200 HP
WX,Y3,Y4,Z3,Z4,Y8,ZB
1977
301
135 HP
WB,YW,YX,YH,YK
350
170 HP
YA,YB,XB,XC,Y9
400
180 HP
400
180 HP
YU,Y4,XA,Y7,XK
400
200 HP
WA,Y6
1978
301
140 HP
XA,XC,XL,YM
301
140 HP
XD,XB,YL,YP
301
150 HP
XF,XH,XU,XW
400
180 HP
XJ,XK,X9,YK,YH,YS
400
180 HP
YT,YJ,YR,YW,YA,YU
400
220 HP
WC,X7
1979
301
135 HP
PX7,PX9,PXF
301
135 HP
PXH,PXP,PXR
301
150 HP
PWA,PWB
301
150 HP
PX4,PX6,PXL,PXN
301
150 HP
PXS,PXT,PXU,PXW
400
220 HP
PWH,LAST 400
What year model is each one?
85 model
was for a xr cheers
Never the less there was a XT250 edition with double header pipes (XT250LC 1984) that may do the job but you must check the exhaust ports first because the header pipes may not be the same inner diameter and the engine will not run correctly.
thanks mate
I am really sorry (quite tired).
The XRs would fit but you still have to examine the exhaust's inner diameter to be the same. Apart from that they fit.
are they the same size pipe
ok cool thanks
×