K = KANSAS CITY, MISSOURI (LEEDS)
they made Chevelle (1964-1972)
El Camino (1964-1972)
Monte Carlo (1971-1972)
GMC Sprint (1971-1972)
180807 = sequnntial production number - The sequential starting number for the 1968 Chevelle was 100001 at all U.S. Chevelle assembly plants.
If it is a steel crank, it would probably be a 6223 casting.
It may have dimple rods. "Pink" rods are high performance small block rods, not big block. I guess it is possible that it is a converted 4 bolt main. But that ED code is the 325 hp version and should be only a 2 bolt main block, unless for some reason they ran out of two bolt blocks that day and had a use a 4 bolt in its place. That is highly unlikely though.
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