Shown here is our 3.75" stroke crankshaft for low deck "B" (383/400) engines. This crank is popular for 451 stroker setups in 400 blocks. Crank includes the following specs: Stroke: 3.750" / Block Type: B / Main Journal Diameter: 2.625" / Rod Journal Diameter: 2.375" / Rod Journal Width: 2.050" / Pre-Balanced Bobweight: 2300 Grams / Counterweight Diameter: 7.120" / Flange Bolts: 6 x 7/16"