4.070" bore, 3.622" stroke, 6.125" rod length, -19.4cc dome volume

J312031

12031

Hands down, the best forged piston for your high performance LS engine! Our Asymmetrical FSR (Forged Side Relief) forging is engineered for today’s high power normally aspirated and forced induction LS engines. The exclusive asymmetrical skirt maintains a larger skirt area on the heavily stressed major thrust side, while reducing friction with a smaller skirt on the minor thrust side. The result is a high strength, lightweight piston that outperforms the competition! Note: For applications over 800hp, a thicker wall wrist pin is recommended. Features: Pin #927-2250-15-51C (106g) for use with 6.125 Rod Length Round Wire Locks # 927-073-MW Includes: Accumulator Grooves Double Pin Oilers Offset Wrist Pin Piston Specification: Make: CHEVROLET Engine: CHEVROLET LS GEN III/IV Bore Diameter: 4.070 Compression Height: 1.304 Compression Ratio with 64cc chamber volume: 9.3 Compression Ratio with 68cc chamber volume: 9.0 Compression Ratio with 70cc chamber volume: 8.8 Piston Volume: -19.4 Cylinder Head: LS 12 DEG/15 DEG COMBO VR Piston Pin Outside Diameter: 0.927 Piston Pin Length: 2.250 Piston Pin Material: 5115 Ringset Included: No Top Compression Ring Thickness: 0.048 Second Compression Ring Thickness: 0.06 Oil Ring Thickness: 0.1175 Piston Material: 2618 Forging Type: FSR Piston Avg Weight: 443 Pin Wall Thickness: 0.170 Piston Type: Dish