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Gary
Gary, Pontiac Technician
Category: Pontiac
Satisfied Customers: 16393
Experience:  15 years GM master tech/15 years ASE master
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Im in the uk and just inported a 67 firebird the engine

Customer Question

Customer: ***** ***** im in the uk and just inported a 67 firebird the engine number is ***** yp is the engine a400 or not any help would be good
JA: Thanks. Can you give me any more details about your issue?
Customer: she a 1967 firebird with a 4speed man gearbox
JA: OK got it. Last thing — JustAnswer charges a fee (generally around $18) to post your type of question to Pontiac Experts (you only pay if satisfied). There are a couple customers ahead of you. Are you willing to wait a bit?
Customer: that ok with me
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Submitted: 1 year ago.
Category: Pontiac
Expert:  Gary replied 1 year ago.

a YP code at the end of the engine stamp number is ***** up as a 1967 350 engine but also could be a 70's 400 or an early 60's 326

is that 030737YP the stamped number ?

since they used YP a few times can you tell me the casting code number on the block so we can be 100 % sure if this is a 350 or a 400 block ?

Customer: replied 1 year ago.
hi yes 030737 YP where do i find the casting code num
Expert:  Gary replied 1 year ago.

should be something like this picture a cast set of raised numbers

Expert:  ASEMaster35yrs replied 1 year ago.

The YP code is a 326ci for 1967. Beginning in mid-1967, the block casting number changed location from the distributor pad to the rear of the block, just behind the #8 cylinder.

The block date code is found just to the left of the distributor hole at the back of the block.

Date Code:
The date code is cast on the distributor pad. It is a 3 or 4 digit code. The first digit will be a letter. A=January, B=Febuary, C=March, etc. Followed by a 1 or 2 digit number for the day of the month. The last digit will be the year.

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 XB

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 YT,YW

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 XZ

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

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

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 Y4,Y6,Y9,Z4,Z6

455 290 HP W8,Y8

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 ZX,ZF

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

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

Casting numbers

1967 (326 c.i.d.) #9786339
1967 (400 c.i.d.) #9786133
1967 (428 c.i.d.) #9786135
1968 (350 c.i.d.) #9790079
1968 (400 c.i.d.) #9790071
1968 (400 RA) #9792506
1968 (428 c.i.d.) #9792968

1969 (350 c.i.d.) #9790079
1969 (400 c.i.d.) #9790071
1969(400 RA IV) #9792506
1969 (428 c.i.d.) #9792968
1969 (303 c.i.d.) #546313
1969 (400 RA V) #9792968
1969 (400 RA V) #545887

1970 (350 c.i.d.) #9799916
1970 (400 c.i.d.) #9799914
1970 (400 RA III) #9799914
1970 (400 RA IV) #979991(5)
1970 (400 RA V) #481708
1970 (455 c.i.d.) #9799140
1971 (350 c.i.d.) #481990
1971 (400 c.i.d.) #481988
1971 (455 H.O.) #483677
1971 (455 c.i.d./late H.O.) #485428
1972 (350 c.i.d.) #481990
1972 (366 c.i.d.) #(485)212
1972 (400 c.i.d.) #481988
1972 (455 c.i.d.) #485428
1973 (350 c.i.d.) #488986

1973 (400 c.i.d.) #481988
1973 (455 c.i.d.) #485428
1973 (455-SD) #(490)132
1974 (350 c.i.d.) #488986
1974 (400 c.i.d.) #481988
1974 (455 c.i.d.) #485428
1974 (455-SD) #(490)132
1975 (350 c.i.d.) #488986
1975 (400 c.i.d.) #488986 early
1975 (400 c.i.d.) #500557 late
1975 (455 c.i.d.) #500813
1976 (350 c.i.d.) #488986
1976 (400 c.i.d.) #500557
1976 (455 c.i.d.) #500813

Expert:  ASEMaster35yrs replied 1 year ago.

These are all the YP listings:

See: http://www.pontiacpower.net/engcode01.html

Code Car Year CID HP Trans RPO VIN Carb Block Cast Main Notes

YP A-body 76 350 160hp Turbo 350L-30M1x24889862AC

YP B-body 76 350 160hp Turbo 350L-30M1x24889862AC

YP X-body 74 350 200hp Turbo 350L-76K1x44889862GTO low comp

YP A-body 73 400 185hp ManualL-65P1x24819882

YP A-body 71 350 250hp PowerglideL-30 1x24819902

YP A-body 78 301 140hp Turbo 350L-27Y1x25259342

YP A-body 65 326 285hp PowerglideL-76 1x497788402

YP A-body 66 326 285hp PowerglideL-76 1x497788402

YP A-body 67 326 285hp Turbo 400L-76 1x497863392

YP A-body 68 350 320hp Turbo 400L-76 1x497900792

YP B-body 71 350 250hp PowerglideL-30 1x24819902

YP B-body 78 301 140hp Turbo 350L-27Y1x25259342

YP F-body 71 350 250hp PowerglideL-30 1x24819902

Expert:  ASEMaster35yrs replied 1 year ago.

This engine is not original to your vehicle.

Expert:  Gary replied 1 year ago.

where you able to get the casting number off the block ?

Expert:  Gary replied 1 year ago.

I am sorry for the other experts post being confusing with wrong information as you can clearly see the YP can be a few different engine sizes

knowing the casting numbers will clear up what year and engine size this is

Expert:  Gary replied 1 year ago.

where you able to get those casting numbers ?