The KB PISTONS Super Duty series offers high-performance pistons designed for demanding engine rebuilds and upgrades. This model features a 4.250-inch bore size, suitable for engines requiring precise and durable components. Constructed with an anodized top ring groove and crown, the piston ensures enhanced resistance to wear and optimal sealing. The Line2Line Abradable skirt coating, applied at a total thickness of .003 inches, provides a zero initial fit that allows the coating to hone in for a tight, quiet running clearance, reducing noise and improving engine longevity. Round wire locks secure the piston rings firmly in place, maintaining proper compression and preventing ring rotation during operation. The premium Hastings 1.2mm top ring with a steel nitride coating offers excellent durability and effective sealing, while the ductile Napier second ring enhances oil control and reduces blow-by. Forced wrist pin oiling ensures adequate lubrication for reduced wear and smoother operation. This M8 version features a flat top design with a 1.2cc combustion chamber, a compression height of 1.083 inches, and valve pockets sized to accommodate 1mm oversize valves, making it compatible with a variety of performance applications. All necessary rings, wrist pins, and wrist pin locks are included, simplifying installation. Sold as a pair, these pistons are ideal for rebuilds targeting increased compression and performance, providing reliability and efficiency for engines within the specified bore size and compression ratio range.
Features:
- Anodized top ring groove and crown for enhanced durability
- Line2Line Abradable skirt coating at .003 inches for a tight, quiet run
- Round wire locks for secure ring retention
- Premium Hastings 1.2mm steel nitride top ring for durability and sealing
- Ductile Napier second ring for improved oil control
- Forced wrist pin oiling for reliable lubrication
- Flat top design with 1.2cc combustion chamber and 1.083-inch compression height
- Valve pockets sized for 1mm oversize valves
- Includes all rings, wrist pins, and wrist pin locks
