BBC Domed Piston Set 4.280 Bore +26cc

The BBC Domed Piston Set 4.280 Bore +26cc by KB Performance Pistons represents a precision-engineered solution for big-block Chevrolet builders targeting increased compression and reliable high-rpm performance. Designed for serious enthusiasts and professional engine builders, this piston set delivers the geometry and durability required in street, strip, and competition applications. The domed crown configuration adds crucial cubic centimeters to your combustion chamber, enabling higher effective compression ratios without extensive cylinder head modifications.

KB Performance Pistons manufactures these components using premium forged aluminum alloy, ensuring exceptional strength under extreme load and temperature cycling. The 4.280-inch bore specification fits modern big-block applications with tight tolerances, while the +26cc domed design optimizes chamber volume for improved fuel burning efficiency and detonation resistance. The piston skirt design minimizes friction and noise while maintaining lateral stability in the cylinder, critical for maintaining ring seal integrity and oil control during aggressive acceleration and sustained high-rpm operation. Each piston in this set is individually machined and tested to meet KB's strict quality standards for weight matching and dimensional accuracy.

This piston set suits BBC (big-block Chevrolet) engine builds ranging from 427 to 572 cubic inches, particularly where compression ratios between 10.5:1 and 12.5:1 are targeted. Installation requires proper ring end-gap clearancing, pin-to-wall clearance verification, and rod-to-piston-to-head geometry confirmation before final assembly. Pairing these pistons with premium rings, quality connecting rods, and a well-prepared block ensures longevity in turbocharged, supercharged, or naturally aspirated configurations. Consult KB Performance documentation or your engine builder to confirm compatibility with your specific application, rod length, and cylinder head configuration.