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United Engine Machine KB346.STD

Pontiac 400ci Hypereutectic Pistons D-Cup Dish 17cc Standard

United Engine Machine KB346.STD


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Estimated ship date 01/26/18 if Ordered Today
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United Engine Machine KB346.STD Pontiac 400ci Hypereutectic Pistons D-Cup Dish 17cc Standard $426.99
Pontiac 400ci Hypereutectic Pistons
  • D-Cup Dish -17cc
  • 4.120" Bore
  • Use w/6.630'' Connecting Rod & 3.750'' Crank Stroke
  • Comp. Ratio: 9.6:1/71cc; 8.4:1/87cc; 7.8:1/96cc; 7.1:1/111cc
  • 8/pkg

  • United Engine Machine KB346.STD Details

    Pontiac 400ci

  • Step Dish
  • Note: Designed to work with 1967 and later 14-degree and 20-degree heads. Piston is .025" below a 10.250" deck. Check small end of rod to piston before assembly / .045" clearance per side minimum.

    Technical Specs:
  • Alloy: Hypereutectic 390 Alloy
  • Bore: 4.120''
  • Crankshaft Stroke: 3.750''
  • Connecting Rod Length: 6.630''
  • Deck Height: 10.250''
  • Compression Height: 1.710''
  • Pin Size: 0.980'' x 3.000''
  • Pin Location: Centered
  • D-Cup Dish Top: -17.0cc 2 Valve Reliefs
  • Intake Valve Relief: 0.248" Depth / 2.210" Diameter
  • Exhaust Valve Relief: 0.248" Depth / 2.210" Diameter
  • Top Landing Height: 0.300''
  • Ring Grooves: 5/64'' Top; 5/64'' Middle; 3/16'' Bottom
  • Gram Weight: 557/163
  • Compression Ratio: 9.6:1 w/71cc Combustion Chamber Heads; 8.4:1 w/87cc Combustion Chamber Heads; 7.8:1 w/96cc Combustion Chamber Heads; 7.1:1 w/111cc Combustion Chamber Heads

  • Specifications:

    Manufacturer's Part Number:

    100% CNC Machined Pistons

    New high silicon alloys and diamond tooling have give Keith Black designers the material and equipment for performance breakthroughs in engine design. KB piston are 100% CNC machined and T-6 heat treated from 16%-18% silcon Hypereutectic alloy. Features include drilled oil returns and pin oil supply, .072'' spiral wound retaining ring, 100% diamond turned, compensated high strength ring lands, high top ring location, 360° pressure pin oiling, diamond honed pin hole and lightweight rigid rib skirt design.


    • 390 Hypereutectic alloy with 16% Silicon
    • Fully machined crowns and valve reliefs
    • Drilled oil drain backs
    • Full floating wrist pins
    • Triple wound spiral locks
    • Reflective alloy allows 2% power increase
    • Quench dome technology minimizes deterioration
    • Zero deck quench designs
    • Sold in Sets (except when noted as 1 piston per package)

      Click here for reference guide to piston top designs

    Items You Need
    Only $96.99
    Order Today

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