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Pontiac Muscle Car - Pontiac Engines

  To determine what engine is installed, there are three things you can check. They will help you determine if you have a number matching engine or a transplanted one.
1. Engine Production Date Code
2. Engine Code
3. Engine Casting Number

  All blocks were cast with a date production code. This code is on the distributor pad. This is a letter, followed by two or three digits. The letter signifies the month (A=January, etc.). The letter "L" stands for the month of December for all years, except 1966 (1967 model) when the letter "M" was used for December. The 2nd and 3rd (if used) digits represent the month of the year. The last digit designates the year of production (not necessarily the model year).
Examples:
A #9778840 block with a date code of F25 = June 2, 1965.
A #9790071 block with a date code of L248 = December 24, 1968.

  The engine code is located on the front of the block, just in front of the #2 cylinder. The list below covers different models but not all are included.

  Beginning in 1967 the block casting number changed location from the distributor pad to the rear of the block, just behind the #8 cylinder. The list below covers different models but not all are included.