CP-Carrillo BC1103-030 Bullet Series Forged Piston Set SBC 4.155 Bore +.030 Over Flat Top

The CP-Carrillo BC1103-030 is a Bullet Series forged piston set designed for Small Block Chevy engines using 23° cylinder heads. This set delivers a 4.155" bore diameter (+.030" over standard), a -6.9cc flat top crown, and a 11.5:1 compression ratio (with a 64cc head), making it a strong choice for high-performance naturally aspirated builds.

Key Specifications:

• Bore: 4.155" (+.030" oversize)
• Stroke: 3.875"
• Rod Length: 5.850"
• Compression Height: 1.219"
• Crown: -6.9cc Flat Top with symmetrical valve pockets
• Compression Ratio: ~11.5:1 (with 64cc head)
• Advertised Piston Weight: 433 grams each
• Application: Normally Aspirated
• Set Includes: 8 pistons and matching ring sets

Key Features:

• Forged from 2618 aluminum alloy for superior strength and heat resistance
• Designed specifically for all 23° cylinder heads
• Symmetrical valve pockets with .310" deep intake pockets for maximum flow compatibility
• 1.5mm steel gas nitride top ring, 1.5mm Napier second ring, and 3.0mm oil ring included
• .927" x 2.500" wrist pins with .150" wall standard included
• Proudly manufactured in the USA at CP-Carrillo's Irvine, California facility
• Multi-step inspection process ensuring precise dimensional tolerances

CP-Carrillo Bullet Series pistons are engineered for performance builders who demand consistency and durability. Each piston kit includes a spec sheet with piston-to-wall clearance recommendations. Rings are pre-sized for the application; OEM rings are not compatible.