Carrillo BCR1320-040 Small Block Chevy Flat Top Piston Set Bore - 4.040

The Carrillo BCR1320-040 is a precision-engineered flat top piston set designed for small block Chevy engines. These high-performance pistons feature a -6cc dish volume and are optimized for 23-degree cylinder heads with a 20/30 valve pocket configuration.

Key Specifications:

• Bore diameter: 4.040 inches
• Stroke: 3.500 inches
• Rod length: 6.000 inches
• Compression ratio: 10.2:1 (with 64cc combustion chamber)
• Dish volume: -6cc flat top design
• Valve pocket configuration: 20/30 shift pattern for 23-degree heads

Carrillo pistons are manufactured from high-quality forged aluminum alloy and feature precision CNC machining for optimal ring seal and durability. The flat top design with minimal dish volume provides an excellent balance of compression ratio and detonation resistance, making these pistons ideal for street/strip applications and performance rebuilds. The 20/30 valve pocket shift allows proper valve clearance with aftermarket cylinder heads featuring 23-degree valve angles.

This piston set is engineered to work with 6.000-inch connecting rods and is designed to achieve 10.2:1 compression ratio when paired with cylinder heads featuring 64cc combustion chambers. Proper ring gap and piston-to-wall clearance should be verified during installation per Carrillo specifications.