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Engine Identification 1. Production Date Code 2. Block casting number 3. Engine Code 1. Production Date Code on the block. This can be found on the distributor pad. It consists of letters A-L for month (A=January, etc.) One exception is that 1966 blocks made for 1967 model year have an M for December instead of L. The second digit or digits (there could be 2) are the day of the month. The last digit identifies the year the block was cast. Production Date Code F129 F=June 12=12th of the month 9=1969 2. Block casting number. This is found on the distributor pad for 1964, 1965, 1966, and the first part of the year in 1967. Then midway through 1967 it was moved to the back of the block behind the number 8 cylinder. Year     CID         Casting Number 1964     389         9773155 1965     389         9778789 1966     389         9778789 1967     400         9786133 1968     400         9790071 1968     400         9792506 1969     400         9790071 1969     400         9792506 1969     400         9792968 1969     400         545887 1970     400         9799914 1970     400         9799915 1970     400         481708 1970     455         9799140 1971     400         481988 1971     455         483677 1971     455         485428 1972     400         481988 1972     455         485428 1973     400         481988 1973     455         485428 1973     455         490132 1974     350         488986 3. The Engine Code can be found on the front of the engine block. It is stamped on the right hand bank on a machined pad. The engine code is directly below the engine production number. Engine Code        123456          WS      22P100001 123456 -Engine Production Number (No correlation to the Vehicle VIN) WS -Engine Code 22P100001 -Engine VIN Code added late 1967. (2=Pontiac, 2=Model Year, P=Pontiac Assembly Plant, 100001=Last six numbers of the car VIN) Engine Code Legend Letter Code -Two letters stamped on front of block that make up the Engine Code. CID -Cubic Inch Displacement HP -Horse Power Trans -Transmission installed (Auto=Automatic, Man=Manual) 1964 Letter Code CID HP Trans 76X 389 348 Man 77J 389 348 Auto 78X 389 325 Man 79J 389 325 Auto 1965 Letter Code CID HP Trans WS 389 360 Man WT 389 335 Man YR 389 360 Auto YS 389 335 Auto 1966 Letter Code CID HP Trans WS 389 360 Man WT 389 335 Man WV 389 360 Man WW 389 335 Man XE 389 335 Auto XS 389 360 Man YR 389 360 Auto YS 389 335 Auto 1967 Letter Code CID HP Trans WS 400 360 Man WT 400 335 Man WV 400 360 Man WW 400 335 Man XL 400 255 Auto XM 400 255 Auto XP 400 360 Auto XS 400 360 Man YR 400 360 Man YS 400 335 Auto YZ 400 360 Auto 1968 Letter Code CID HP Trans WS 400 360 Man WT 400 360 Man WY 400 360 Man XM 400 265 Auto XP 400 360 Auto XS 400 360 Man XW 400 360 Auto YS 400 350 Auto YZ 400 360 Auto 1969 Letter Code CID HP Trans WS 400 366 Man WT 400 350 Man WW 400 370 Man XP 400 370 Auto XX 400 265 Auto YS 400 350 Auto YZ 400 366 Auto 1970 Letter Code CID HP Trans WA 455 360 Man WS 400 366 Man WT 400 350 Man WW 400 370 Man XP 400 370 Auto YA 455 360 Auto YS 400 350 Auto YZ 400 366 Auto 1971 Letter Code CID HP Trans WC 455 335 Man WK 400 300 Man WL 455 335 Man WT 400 300 Man YC 455 325 Auto YE 455 335 Auto YS 400 300 Auto 1972 Letter Code CID HP Trans WK 400 250 Man WM 455 300 Man WS 400 250 Man YB 455 300 Auto YC 455 250 Auto YS 400 250 Auto YT 400 250 Auto 1973 Letter Code CID HP Trans WK 400 230 Man WP 400 230 Man WS 400 230 Man X5 400 230 Auto X7 455 250 Auto XE 455 250 Auto XK 400 230 Auto XL 455 250 Auto XM 455 250 Auto XN 400 230 Auto XX 400 230 Auto Y3 400 230 Auto Y6 400 230 Man YA 455 250 Auto YC 455 250 Auto YD 455 250 Auto YF 400 230 Man YG 400 230 Man YK 455 250 Auto YS 400 230 Auto YT 400 230 Auto YY 400 230 Auto ZA 455 250 Auto ZC 455 250 Auto ZS 400 230 Auto 1974 Letter Code CID HP Trans WP 350 200 Man YS 350 200 Auto YP 350 200 Auto ZP 350 200 Auto Visitor's Rides! 1964 GTO Visitor's Rides 1965 GTO Visitor's Rides 1966 GTO Visitor's Rides 1967 GTO Visitor's Rides 1968 GTO Visitor's Rides 1969 GTO Visitor's Rides 1969 GTO Judge Visitor Rides 1970 GTO Visitor's Rides 1970 GTO Judge Visitor's Rides 1971 GTO Visitor's Rides 1971 GTO Judge Visitor's Rides 1972 GTO Visitor's Rides 1973 GTO Visitor's Rides 1974 GTO Visitor's Rides 2004 GTO Visitor's Rides 2005 GTO Visitor Rides 2006 GTO Visitor Rides GT-37/T-37 Visitor Rides Other Visitor's Rides Pics Show GTO 64-06 Privacy Policy E-Mail Pics to GTO Alley!