Racetec 1001685 AutoTec II Flat Top Piston Set Features:

• Manufactured on 2618 material that will accept most mild boosted applications
• CNC Precision used in every manufacturing operation
• Valve pockets machined for oversized valves and high lift cams
• Critically machined ring grooves for 1.5mm, 1.5mm, 3.0mm rings
• Top ring land gas distribution grooves to enhance performance and improve ring seal
• 51 Series 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

RaceTec 1001685 Autotec II Flat Top Piston Set Specs:

• Engine Family: 15-Degree/12-Degree GM Gen III/IV LS
• Displacement reference: 346 cu. in. (5.7L)
• Bore: 3.898 in.
• Stroke: 3.622 in.
• Rod Length: 6.125 in.
• Compression Height: 1.304 in.
• Crown Volume: -6.1 cc
• Piston Style: Flat Top w/2 Valve Reliefs
• Alloy: 2618
• Ring Grooves: 1.5 mm Top, 1.5 mm Second, 3.0 mm Oil

RaceTec 1001685 AutoTec II Flat Top Piston Set Notes:

• Requires RaceTec AT3905 Ring Set or Equivalent (Sold Separately)
• Compression Ratios:
  • 10.0:1 @ w/64 cc Heads
  • 9.5:1 @ w/68 cc Heads
  • 9.3:1 @ w/70 cc Heads
• Will work with most 12 degree and 15 degree cylinder heads