Advanced, lightweight FSR forging that eliminates stress concentrations for superior strength. Stronger than traditional designs but up to 20% lighter.

• Accumulator grooves for improved ring seal
• Thick top ring lands to accommodate moderate forced induction/nitrous applications

Rings Included

• Lightweight, low friction metric ring package included
• 1.2mm CARBON STEEL top ring, 1.5mm Napier 2nd ring, 3.0mm standard tension oil ring
• Minimal filing required

Pins & Locks:

• High quality 2.250” pin further reduces reciprocating weight
• Carbon steel wire locks included

Specifications:

• Engine: SMALL BLOCK CHEVROLET
• Bore Diameter: 4.030
• Compression Height: 1.125
• Compression Ratio with 58cc chamber volume: 10.4
• Compression Ratio with 64cc chamber volume: 9.8
• Compression Ratio with 70cc chamber volume: 9.3
• Piston Volume: -16.0
• Cylinder Head: CHEVROLET 23 DEG 20/30
• Piston Pin Outside Diameter: 0.927
• Piston Pin Length: 2.250
• Piston Pin Material: 5115
• Ringset Included: Yes
• Top Compression Ring Thickness: 1.2mm
• Second Compression Ring Thickness: 1.5mm
• Oil Ring Thickness: 3.0mm
• Piston Material: 4032
• Forging Type: FSR
• Piston Avg Weight: 376
• Pin Wall Thickness: 0.150
• Piston Type: Dish
• Ring Set: JG31F8-4030-2