CP-Carrillo BC1031-020 Bullet Series Forged Piston & Ring Kit 4.020 Bore SB Chevy

The CP-Carrillo BC1031-020 is a Bullet Series forged piston and ring kit engineered for Small Block Chevy applications running 23° cylinder heads. Designed for high-performance engine builds, this kit delivers race-proven CP-Carrillo quality at an accessible price point — without compromising strength, precision, or durability.

Key Specifications:

• Bore: 4.020 in. (102.108 mm)
• Stroke: 3.750 in.
• Rod Length: 6.000 in.
• Compression Height: 1.125 in.
• Piston Style: Dish (-16.2cc) with two valve reliefs
• Compression Ratio (64cc heads): 9.4:1
• Wrist Pin: 0.927 x 2.500 in. Chromoly with wire locks
• Ring Pack: 1.5mm steel gas nitride top ring / 1.5mm Napier second ring / 3.0mm oil ring
• Material: 2618 forged aluminum alloy

Notable Features:

• Piston balance within ±1 gram
• Dual forced pin oilers
• Contact reduction grooves
• Accumulator groove for improved ring seal
• Forged side relief
• Symmetrical valve pockets with .310-deep intake pockets
• Made in the USA

The BC1031-020 is a power-adder compatible piston set ideal for forced induction and nitrous builds. Computer-designed forgings and tight manufacturing tolerances make this kit a reliable foundation for any serious Small Block Chevy performance engine.