Racetec 1000928 RaceTec Flat Top Piston Set Features:

• Manufactured on 2618 material forgings with light weight in mind
• CNC Precision used in every manufacturing operation
• Valve pockets machined for oversized valves and high lift cams
• Critically machined super flat ring grooves for 1.5mm, 1.5mm, 3.0mm rings
• Top ring land gas distribution grooves to enhance performance and improve ring seal
• 927-2250-51-18C Heavy Duty Chromoly wrist pins, pin fit, wire locks, broached double pin oilers, and accumulator groove are included at no extra charge
• Diamond tooling used throughout production including ring grooves and skirts, for unrivaled tolerance control and finish
• Dyno tested and race track proven designs

RaceTec 1000928 Racetec Flat Top Piston Set Specs:

• Engine Family: 15-Degree GM Gen III/IV LS Extreme Duty FSR
• Displacement reference: 389 cu. in. (6.4L)
• Bore: 4.135 in.
• Stroke: 3.622 in.
• Rod Length: 6.125 in.
• Compression Height: 1.304 in.
• Crown Volume: -5 cc
• Piston Style: Flat Top w/2 Valve Reliefs
• Alloy: 2618
• Wrist Pin Diameter: 0.927 in.
• Ring Grooves: 1.5 mm Top, 1.5 mm Second, 3.0 mm Oil

RaceTec 1000928 RaceTec Flat Top Piston Set Notes:

• Requires RaceTec AT 4135 Ring Set or Equivalent (Sold Separately)
• Compression Ratios:
  • 11.2 @ w/64 cc Heads
  • 10.7 @ w/68 cc Heads
  • 10.4 @ w/70 cc Heads