Carrillo BLSR1201-010 CP Bullet LS7 Forged Piston & Ring Kit 4.135 Bore +5cc Dome R-Series

The CP-Carrillo Bullet Series BLSR1201-010 is a complete forged piston and ring kit engineered specifically for GM LS7 engines equipped with 12-degree valve angle heads. Built in the USA from high-strength 2618 forged aluminum alloy, this kit delivers race-proven durability and precision without sacrificing value.

This R-Series kit is configured with a 4.135-inch bore, 4.125-inch stroke, and a +5cc solid dome crown, yielding a 13.4:1 compression ratio when used with a 66.5cc chamber. The 6.125-inch rod length and 1.055-inch compression height make this an ideal choice for stroker LS7 builds targeting high compression and maximum power output.

Key Specifications:

• Bore: 4.135 in.
• Stroke: 4.125 in.
• Rod Length: 6.125 in.
• Compression Height: 1.055 in.
• Crown Volume: +5cc Dome
• Compression Ratio (w/ 66.5cc chamber): 13.4:1
• Alloy: 2618 Forged Aluminum
• Head Compatibility: LS7 12° Valve Angle Heads
• Pin Diameter: 0.927 in.
• Pin Length: 2.250 in.
• Pin Wall: 0.180 in. standard

Kit Includes:

• 0.927 x 2.250 in. wrist pins
• 1.2mm steel gas nitride top ring
• 1.2mm Napier second ring
• 3.0mm oil ring

CP-Carrillo's Bullet Series brings the same computer-designed forgings, tight tolerances, and rigorous quality control found in their top-tier racing pistons to a performance-focused price point. Compatible with power adder applications, the BLSR1201-010 is also sold under the alternate part number BLSR1201010.