The ring lands, crown, and bottom band of these pistons are specifically designed for nitrous applications. The valve reliefs accommodate most oversized valves and long duration, wide lobe separation cams. Precision CNC machined ring grooves accept 1/16, 1/16, 3/16 rings. HNS (Hardened Nitrous Series) rings are available for this series, change ring prefix to J820F8. Bore: 4.040 Stroke: 3.500 Rod: 6.000 Deck: 9.000

Includes:
Pin #927-2950-15-51S (140g)
Contact reduction grooves
Double spiro locks #927-042-CS
Double pin oilers
Price per piston.