Carrillo BBCSRE5326-115A CP Bullets Big Block Chevy SR20 Forged Piston Set 4.615 Bore

The CP Carrillo BBCSRE5326-115A is a CP Bullets forged piston set engineered for naturally aspirated Big Block Chevy engines built with 20-degree SR20-style cylinder heads. Featuring a 4.615-inch bore, this set is matched to a 4.250-inch stroke and 6.535-inch rod length with a 1.120-inch compression height and a 24.5cc dome for high compression naturally aspirated applications.

Key Specifications:

• Bore: 4.615 in. (+0.015 in. oversize)
• Stroke: 4.250 in.
• Rod Length: 6.535 in.
• Compression Height (CH): 1.120 in.
• Dome Volume: 24.5cc
• Ring Package: 1mm top ring / 1mm second ring / 3mm oil ring
• Application: Big Block Chevy with 20° SR20-style cylinder heads (N/A)

Key Features:

• Forged from 2618 aluminum alloy for exceptional strength and thermal stability under high cylinder pressures
• Designed specifically for naturally aspirated Big Block Chevy builds using 20-degree SR20 cylinder heads
• Includes valve reliefs to accommodate larger cam profiles and high-lift valvetrain components
• Vertical gas ports for maximum ring seal and improved combustion efficiency
• Proudly manufactured in the USA by CP-Carrillo in Irvine, California
• Each piston undergoes rigorous multi-step quality inspection before leaving the facility

CP-Carrillo has been producing world-class forged pistons and connecting rods since 1963, trusted by professional racers across drag racing, circle track, and road racing disciplines. The Bullets series delivers race-proven performance in a shelf-available configuration for serious engine builders.