BBC Domed Piston Set 4.310 Bore +26cc

The KB Performance Pistons BBC Domed Piston Set 4.310 Bore +26cc is a hypereutectic piston assembly engineered for Big Block Chevy engine builds demanding elevated compression and combustion chamber volume. This complete set of eight pistons features domed crowns and a +26.00 cubic centimeter displacement increase per piston, making it essential for serious performance builders targeting higher compression ratios and improved combustion efficiency in BBC stroker and modified engine applications.

Each piston is machined to a precise 4.310-inch bore diameter with 5/64 x 5/64 x 3/16-inch ring groove specifications, engineered to accept OEM and aftermarket ring packages without modification. The hypereutectic construction—an aluminum-silicon alloy—provides thermal stability and reduced expansion compared to forged alternatives, critical for street and strip engines where cylinder bore clearance precision directly impacts blowby control and ring sealing. The domed crown geometry increases compression without requiring external spacers or block decking, a practical advantage for builders working within stock deck heights or managing complex timing chain clearance.

This piston set is designed for builders planning boost applications, nitrous oxide systems, or naturally aspirated high-compression builds where the +26cc dome volume supports ignition timing and combustion efficiency gains. The set format ensures matched weight distribution across all eight cylinders—critical for minimizing reciprocating mass imbalance and vibration at elevated RPM. These pistons are compatible with standard BBC connecting rods and require verification of wrist pin fit and deck clearance during installation.

KB Performance Pistons holds deep market recognition in Big Block and Small Block Chevy performance segments for achieving consistent compression ratios and thermal performance across matched sets. Verify ring end-gap clearance, crown-to-valve clearance, and piston-to-wall running clearance before final assembly; BBC builds with aftermarket cylinder heads demand individual mockup validation.