GTO Data and ID Guide: 1964-1974. Pete Sessler

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       All standard 335-hp engines were outfitted with a new, pancake-style air cleaner.

1965 Vehicle Identification Number

      The vehicle identification number (VIN) was riveted on an aluminum plate and attached to the driver-side front door-hinge post. There was also a date stamp on the VIN tag indicating date of delivery to the original owner. For 1965, the example of 237275P100001 decodes to:

      Because the 1965 GTO was an option on the Pontiac LeMans Series, no specific number or code indicated 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 show a code for the original engine, it makes counterfeiting a GTO easier. General Motors did not include a code for the engine until 1972 in the VIN, whereas Ford did from 1950 on and Chrysler did from 1966 on.

1965 Engine Codes

      Starting in 1965, Pontiac revised the block numbering system, using a two-letter code. Above this code is the engine unit number, which is either six or seven digits. This number is not related to the vehicle’s VIN. The block’s unit number is the sequential production number for the engine.

      The block codes are two letters and as a general rule, W-code blocks are for manual transmission vehicles and Y-code blocks are for automatics. Most Z-code blocks are also automatics, and X-code blocks can be either manual or automatic transmission vehicles. A typical block code is WT.

      The engine unit number and the engine code are located on the passenger’s side of the block, just below the cylinder head.

      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 day of 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.)

       Cylinder Head Casting Numbers

      The cylinder head codes were cast into the center exhaust port area. For 1965, a portion of the head part number was also cast on the left- and right-end ports.

Cylinder Head	Casting Number
389-ci all	77

       Carburetors

      The part number for the 1965 Carter AFB 4-barrel carburetor was found on a metal tag mounted on the carburetor air horn. For the Tri-Power carbs, the numbers were stamped on a plate and mounted on one of the carburetor mounting screws.

       The 4-speed manual Tri-Power setup received a mechanical linkage that actuated the two end carbs; automatic cars were vacuum equipped. This car has a dealer-installed Ram-Air setup. (Thomas Short Photo)

       Distributors

      The 1965 distributors had the part number stamped and mounted around the distributor shaft.

       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	9778816
3×2-barrel	9778818

       Exhaust Manifolds

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

Location	Part Number
Driver’s side	9779032
Passenger’s side	9779325

1965 Transmissions

      The transmission codes are:

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