Pair this Magnum 3.370" stroke crankshaft with a 6.250" rod to achieve a compression height of 1.305" which is the standard compression height of shelf pistons normally using 3.622" strokes with 6.125" rods. This crankshaft with a 4" bore will achieve 339 cubes. A 4.070" bore will achieve 351 cubes. A 4.125" bore will achieve 360 cubes.
