Racetec 1000763 Autotec Closed Chamber Dome Piston Set Features:

• Manufactured from low-expansion, high-silicon, 4032 material with side reliefs that's excellent for street or strip applications
• CNC Precision machined ring grooves for 1.5 mm, 1.5 mm, 3.0 mm rings
• Top ring land gas distribution groove to enhance performance and improve ring seal
• 990-2800-51-15C wrist pins, pin fitting, wire locks, broached pin oilers, and accumulator groove are included at no extra charge
• Diamond turned skirts

Racetec 1000763 Autotec Closed Chamber Dome Piston Set Specs:

• Engine Family: Big Block Chevy
• Displacement reference: 409 cu. in. (6.7L)
• Bore: 4.155 in.
• Stroke: 3.760 in.
• Rod Length: 6.135 in.
• Compression Height: 1.765 in.
• Crown Volume: 24 cc
• Piston Style: Closed Chamber Dome
• Alloy: 4032
• Wrist Pin Diameter: 0.990 in.
• Ring Grooves: 1.5 mm Top, 1.5 mm Second, 3.0 mm Oil

Racetec 1000763 Autotec Closed Chamber Dome Piston Set Notes:

• Requires RaceTec AT 4155 Ring Set or Equivalent (Sold Separately)
• Compression Ratios:
  • 10.6 @ w/101 cc Heads
  • 10 @ w/107 cc Heads
  • 9.8 @ w/109 cc Heads