Pete Sessler

GTO Data and ID Guide: 1964-1974


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the 1964 GTO was an option on the Pontiac LeMans Series, there was no specific number or code to indicate a GTO. When production reached 100,000 at a particular plant, the consecutive sequence number continued with 200001. The consecutive sequence number was different for a GTO built at another plant. Also, as the VIN does not have a code for the original engine, it makes counterfeiting a GTO easier. General Motors did not include a code for the engine in the VIN until 1972, whereas Ford did from 1950 on and Chrysler did from 1966 on.

      The block code for the 1964 GTO consisted of a three-character (and sometimes four-character) code of numbers and letters. Beneath the block code is the unit number, which in this case is the same as the consecutive sequence number and is taken from the vehicle’s VIN. The block code is located on the passenger’s side of the engine block below the cylinder head/deck.

      The date code is also important. It is cast in the distributor pad and consists of three or four characters as follows: The first is a letter representing the month (A for January, B for February, C for March, D for April, E for May, F for June, G for July, H for August, I for September, J for October, K for November, L for December, M for December 1966 [1967 model only]). The second or third is a digit representing the month. The last is a digit representing the year. N or D represents the work shift when the block was cast, Night or Day. (Beginning in 1969, an additional two numbers represent the year; for example, 69 for 1969.)

       Engine Block Codes

      Compression ratio is 10.75:1 on all engines.

       Cylinder Head Casting Numbers

      The cylinder head codes were cast into the center exhaust port area. For 1964, a portion of the head part number was also cast on the left- and right-end ports.

Cylinder Head Casting Number
389 ci all 9770716

       Carburetors

      The part number for the 1964 Carter AFB 4-barrel carburetor was found on a metal tag mounted on the carburetor air horn. For the Tri-Power carbs, the number was stamped on a plate and mounted on one of the carburetor mounting screws.

       Distributors

      The 1964 distributors had the part number stamped and mounted around the distributor shaft.

Ignition Part Number
Conventional 1111054
Transistor 1111057

       Intake Manifolds

      On 4-barrel engines, the part number is stamped or cast into an intake runner. On Tri-Power manifolds, it can be found on the center and rear intake runners.

Engine Part Number
4-barrel 9770274
3×2-barrel 9775088

       Exhaust Manifolds

      The part number for the exhaust manifold is generally, but not always, found on the outer face of the manifold.

Location Part Number
Driver’s side 545467
Passenger’s side 9773442

      On the Super Turbine 300 2-speed automatic, the transmission code was stamped on the low-servo cover on the passenger’s side of the transmission or on a metal tag.

      The 3- and 4-speed M20 and M21 manual transmissions were used on the GTO and, generally, but not always, had the part number stenciled on the transmission case on the driver’s side of the case, at the rear of the cover. The code number indicated the type of transmission and the production date.

      An identification code is marked in yellow paint on top of the case on 4-speed transmissions. W stands for wide-ratio and 9 stands for close-ratio. On the 3-speed Tempest (Muncie), the letter X indicates a heavy-duty Muncie and is marked on the passenger’s side of the case.

      In 1964, the axle ratio was stamped on the passenger-side axle tube and on the lower left side of the vent. Green paint was used on the top of the differential housing and on the hubs on GTOs made before January 2, 1964.

      The M21 close-ratio 4-speed, according to the GTO club, was not installed by the factory.

The spacious interior provided plenty of room. The standard GTO steering wheel was the LeMans Deluxe wheel and optional was the Custom Sports steering wheel, which came with four brushed-metal spokes and an imitation wood rim. (Photo Courtesy Karl Lacker)

       The spacious interior provided plenty of room. The standard GTO steering wheel was the LeMans Deluxe wheel and optional was the Custom Sports steering wheel, which came with four brushed-metal spokes and an imitation wood rim. (Photo Courtesy Karl Lacker)

For an American car, the GTO had a European flair, but unlike the European cars, it was reasonably priced and could be loaded with lots of options. (Photo Courtesy Marty Cieslak)

       For an American car, the GTO had a European flair, but unlike the European cars, it was reasonably priced and could be loaded with lots of options. (Photo Courtesy Marty Cieslak)

      The interior trim was identical to the LeMans. However, the GTO has the following items as standard and were not available on other LeMans models: the engine-turned appliqué that surrounds the fourgauge dash pods and the large GTO crest on the passenger’s side above the glove box.

      All of these colors were available on the convertibles.

      Exterior color codes can be found on the cowl data plate located on the driver’s side of the firewall and were consistent from plant to plant. The exterior color codes were found on the fifth line of the cowl data plate. The colors listed below were available on all models and were not just GTO colors.