JE Pistons Ultra Series GM Gen III/IV LS 4.075in Bore/3.622in Stroke Set of 8 Pistons - 360770

Ultra Series forged pistons from JE are the industry?s strongest, most fully featured pistons available off the shelf. Offered for a wide range of domestic applications from LS to Big Block and HEMI to Ford Modular, Ultra Series pistons feature JE?s proprietary Aligned Grain Flow forging technology providing next-level tensile strength ideal for the extreme cylinder pressures of power adder engine builds. Equipped with custom level features including thermal barrier crown coating, skirt coating, gas ports, and more, Ultra Series are the ideal pistons for your boost-heavy or nitrous-huffing V8 engine build. As with all JE Pistons products, Ultra Series pistons are made 100% in the USA.

Features & Benefits

• Designed for Power: Every feature on Ultra Series Pistons are optimized to perform high-horsepower racing engines
• Aligned Grain Flow Technology: Exclusively available on JE Ultra Series, this proprietary, in-house forging process maximizes tensile strength to withstand the stresses of high-performance engine environments
• Skirt Coating: Reduces friction and wear on piston skirts and cylinder walls while simultaneously reducing operating noise, especially on cold start
• Thermal Barrier Crown Coating: This ceramic-based coating reflects heat into the combustion chamber, therefore reducing piston crown temperatures and improving exhaust gas scavenging
• High-Strength Wrist Pins: Premium thick-wall wrist pins are manufactured by Trend Performance in the USA and are designed for the demands of high-performance/power-adder builds
• Lateral Gas Ports: Help maintain power-producing ring seal at the top compression ring, even in high RPM and high boost situations
• Optimized Pin Oiling: Enhanced pin oiling features keep pin, pin bores, and small-end lubricated for reduced heat, friction, and wear
• Made 100% in the USA

Specifications: Piston Set, 2618, Flat Top, 4.075 Bore, 1.304 CD, 0.927 Pin, Set of 8.

These pistons utilize our dedicated Forged Side Relief (FSR) forging that was specifically designed to increase strength.

Detailed Specifications

• Piston Volume: -5.00 cc
• Intake Depth: .235 in.
• Oversized Amount: 0.010
• Top Compression Ring Thickness: 0.0475 in.
• Top Groove Width: 0.04750 in.
• 2nd Groove Width: 0.06 in.
• Second Compression Ring Thickness: 0.0600 in.
• Oil Ring Thickness: 0.1175 in.
• Oil Groove Width: 0.11750 in.
• Wrist Pin Wall Thickness: 0.200 in.
• Ring Set Thickness: 1.20 MM x 1.50 MM x 3.00 MM
• Compression Ratio: 10.90:1 / 64.00 CC Head
• Exhaust Angle: 12
• Intake Angle: 12
• Exhaust Diameter: 2.000
• Wrist Pin Length: 2.250 in.
• Intake Diameter: 2.450 in.
• Engine Stroke: 3.622 in.
• OEM Bore Diameter: 4.065
• Connecting Rod Length: 6.125 in.
• Deck Height: 9.240 in.
• Wrist Pin Retainer Part Number: 927-073-MW
• Wrist Pin Part Number: 927-2250-15-51C
• Wrist Pin Material: 9310 Nickel Carbon Steel Alloy
• Forging Type: FSR
• Pro Seal Head Gasket: GM1006-051
• Ring Set - Recommended: JG3108-4075-5
• Engine Family: LS
• Cylinder Head: LS 12 DEG/15 DEG COMBO VR
• Piston Sub-Series: LS Flat Top
• Engine: LS3
• Accumulator Groove: Yes
• Double Pin Oilers: Yes
• Lateral Gas Ports: Yes
• Oversized: Yes
• Pin Fit: Yes
• Skirt Coat: Yes
• Thermal Crown: Yes
• Wrist Pin Included: Yes
• Wrist Pin Retainer Included: Yes