These pistons are specially designed for Big Duke / Big Chief cylinder heads and feature our race proven dome and skirt design. Valve reliefs are designed to accept oversized valves and long duration, tight lobe separation roller cams. Precision CNC machined grooves accept .043 D-wall, 1/16, 3/16 rings. Bore: 4.600 Stroke: 4.250 Rod: 6.535 Deck: 9.780

Includes:
Pin #990-2930-15-51S (150g)
Forced pin oiler, with annular oil reservoir
Price per piston.