CP-Carrillo BLS1204-STD-1 Bullet Series LS 4.125" Bore 4.000" Stroke Forged Piston & Ring Kit

The CP-Carrillo BLS1204-STD-1 is a Bullet Series forged piston and ring kit engineered for Chevrolet LS applications running 12° cylinder heads. Featuring a 4.125-inch bore, 4.000-inch stroke, and -4.6cc flat-top crown, this kit delivers an 11.1:1 compression ratio with a 70cc head and is built to handle the demands of power-adder applications including nitrous oxide, superchargers, and turbochargers.

Key Features:

• Bore: 4.125 in.
• Stroke: 4.000 in.
• Rod Length: 6.125 in.
• Compression Height: 1.115 in.
• Crown Volume: -4.6cc Flat Top
• Compression Ratio: 11.1:1 (with 70cc head)
• Pin Diameter: 0.927 in. x 2.250 in. (included)
• Ring Sizes: 1.5mm steel gas nitride top, 1.5mm Napier second ring, 3.0mm oil ring
• Material: 2618 forged aluminum alloy
• Special low-noise skirt design for reduced piston slap
• Compatible with LS7 12° cylinder heads
• Suitable for power adder use: nitrous oxide, supercharger, and turbocharger applications
• Proudly manufactured in the USA

The Bullet Series combines CP-Carrillo's precision forging expertise — including computer-designed forgings, tight tolerances, and rigorous quality control — in a performance-focused package built for serious LS engine builds.