JE Pistons ::::: JE Pistons 274639 Set of 6 Pistons

JE Pistons 274639 JE Pistons; Not for Turbo or Nitrous Aps; Set of 6 Pistons; Recommended RingSet: J650U6-3740

JE Pistons - Porsche: Designed for air-cooled 911 engines with a Nickel Ceramic bore, JE Porsche Pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined for OEM style rings. (Except 2.7L)

Features:

• Application Specific Forgings for an Optimized, Uniform Crown Thickness
• Contact Reduction Groove to Minimize Frictional Drag
• Accumulator Groove for Increased Top Ring Stability and Sealing
• CNC-Machined Side Relief with Lower Support Band for Additional Skirt Strength
• Honed Pin Bores, Double Pressure Fed Pin Oilers and Wire Locks Included
• JE ProSeal Piston Rings are included with your JE Pistons

Specifications:

• Comp Ratio: 10.5:1
• C/D: 32.8mm
• Dome CC: 41.7
• Rod: 127mm
• Stroke: 74.4mm
• Bore: 95mm
• Gram Weight: 450
• Oversize: STD
• Skirt Type: R
• Head CC: 90

Fitments:

• Porsche 911 Carrera (1984-1989)