Based on the simple theory that the more air you stuff through an engine with as few pauses as possible, the more power you will make, the 408 Windsor is probably the best engineered 351 in existence. This combination allows excellent airflow, weight compromises, and longevity (through stress reduction) making it a great choice, especially for racers on a budget. 4.030 bore - 4.000 stroke - Fat top piston - Forged steel crankshaft - Probe 4340 H-Beam Steel Connecting Rods - Probe SRS forged pistons - Dished pistons available