1955-1996 Chevy Small-Block Performance Guide: Crankshafts ...
The small mainjournal 3.00- and 3.25-inch cranks also had small-diameter rod journals,while all the rest, including the 3.75-inch crank, have the now-standard large rod journals. As a point of reference, a smalljournal crank has 2.30-inch mains and 2.00-inch rods, a large-journal crank features 2.45-inch mains and 2.10- inch rods, and the 3.75 ...