1964
Pontiac GTO

Casting Numbers
 

Block casting number are found on the distributor pad for 1964-66 and the first part of 67. Midway through 1967 it was moved to the back of the block behind the number 8 cylinder.

Engine Code
The engine code can be found on the front of the engine block. It is stamped on the right hand bank of a machined pad. The engine code is directly below the engine production number.

  • 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

Engine Block
9799914

Cylinder Head
9773345

Production Date Code
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 modely year have an M for December instead of L. The second digit or digits ( there should be 2 ) are the day of the month. The last digit identifies the year the block was cast.
0463568 XX

Distributor
1112231 - 400 ci distributor 

Carburetors

Front carburetor - 7041060 - Rochester 2GC 2-bbl 70-72 GM
OE -
7024178 (airhorn casting 7013206, bowl casting 7029683, throttle body casting 15211)

Center carburetor - 7008597 - Rochester 2GC 2-bbl 64 -70? GM
OE 7024173 (airhorn casting 7017917, bowl casting 7019929, throttle body casting 3530)

Rear carburetor - 7041060 - Rochester 2GC 2-bbl 70-72 GM
OE
7024179 (airhorn casting 7013206, bowl casting 7029683, throttle body casting 15211)

Intake Manifold
9770275

Fuel Lines
Aluminum