was identical to the actual vehicle code. Most production blocks, except 1964-66 and most 1967s, received a vehicle identification (V.I.N.) stamp. An optional trans code, if installed in the vehicle, appears nearby, often on top of the other characters. Prior to 1965 (the start of the “two letter” system) the two digit engine code, which was the last two digits of the full six or seven digit part number, was stamped followed by the standard trans code. In other words, the 301 oil filter sticks straight out, unlike other Pontiac blocks which are attached to a housing that aims the oil filter downward.Ī wide variety of specific engine/trans codes are stamped into the front of production blocks. The 301 can easily be recognized by the lateral oil filter location. The Pontiac 400 block was cast with revised motor mount bosses, and will only mount in late Firebirds or Grand Prixs. A new 301 Pontiac short deck engine joined the line-up along with some other “corporate engines”, such as the Olds 403 and the Chevy 305.
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