RaceTec 1000505 AutoTec Inverted Dome/Milled Dish 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 1.5mm, 1.5mm, 3.0mm rings
• Top ring land gas distribution groove to enhance performance and improve ring seal
• 912-2700-51-15C wrist pins or 927-2700-51-15C, pin fit, wire locks, broached pin oilers and accumulator grooves are included at no extra charge
• Diamond turned skirts

RaceTec 1000505 AutoTec Inverted Dome/Milled Dish Piston Set Specs:

• Engine Family: 20-Degree Small Block Ford 351W
• Displacement reference: 410 cu. in. (6.7L) or 420 cu. in. (6.9L)
• Bore: 4.040 in. Bore
• Stroke: Fits Both 4 or 4.100 in.
• Rod Length: 6.250 or 6.200 in.
• Compression Height: 1.235 in.
• Crown Volume: -29.6 or -32 cc
• Piston Style: Inverted Dome/Milled Dish
• Alloy: 4032
• Wrist Pin Diameter: 0.927 in.
• Ring Grooves: 1.5 mm Top, 1.5 mm Second, 3.0 mm Oil

RaceTec 1000505 AutoTec Inverted Dome/Milled Dish Piston Set Notes:

• Requires RaceTec AT 4040 Ring Set or Equivalent (Sold Separately)
• Compression Ratios:
  • 10.1 @ w/54 cc Heads
  • 9.5 @ w/60 cc Heads
  • 8.8 @ w/68 cc Heads