Racetec 1000581 AutoTec Flat Top 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, 1.5, 3.0 rings unless otherwise indicated
• Top ring land gas distribution groove to enhance performance and improve ring seal
• 980-2700-51-15C wrist pin, pin fitting, wire locks, broached pin oilers and accumulator grooves are included
• Diamond turned skirts

RaceTec 1000581 Autotec Flat Top Piston Set Specs:

• Engine Family: Pontiac 400/428
• Displacement reference: 435 cu. in. (7.1L)
• Bore: 4.160 in.
• Stroke: 4 in.
• Rod Length: 6.625 in.
• Compression Height: 1.575 in.
• Crown Volume: -5 cc
• Piston Style: Flat Top w/2 Valve Reliefs
• Alloy: 4032
• Wrist Pin Diameter: 0.980 in.
• Ring Grooves: 1.5 mm Top, 1.5 mm Second, 3.0 mm Oil

RaceTec 1000581 AutoTec Flat Top Piston Set Notes:

• Requires RaceTec AT 4160 Ring Set or Equivalent (Sold Separately)
• Compression Ratios:
  • 11.5 @ w/72 cc Heads
  • 10.6 @ w/80 cc Heads
  • 9.9 @ w/87 cc Heads