LS2 Asymmetrical FSR Dish Top Forged Piston J312025

LS2 Asymmetrical FSR Dish Top Forged Piston 312025 J312025 4.005" bore, 3.622" stroke, 6.125" rod length, -16.6cc dome volume LS2 4.005" FSR PISTONS -16.6cc 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: 4.005

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: -16.6

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: 425

Pin Wall Thickness: 0.170

Piston Type: Dish