Unrivaled Customer Service
And Expert Tech Advice!  
Same Day Shipping Before 11 PM ET
My Cart
Shop By Vehicle
Shop By
Close Menu
Shop By Vehicle
Top Categories
All Categories

Top Categories

All Categories

Free Catalog
E-Mail Signup
My Account
Track Order
Gift Certificates

United Engine Machine Pontiac 400ci Hypereutectic Piston And Ring Kit Step Dish Standard

United Engine Machine KB346KTM.STD


jegs shipping
FREE Shipping
Estimated to ship directly from the manufacturer on 07/25/18
Easy Returns
Easy Returns
Lowest Price Guarantee
Lowest Price Guarantee
United Engine Machine Pontiac 400ci Hypereutectic Piston And Ring Kit Step Dish Standard $554.99
Pontiac 400ci Hypereutectic Piston And Ring Kit
  • 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 KB346KTM.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
    Some parts are not legal for use in California or other states with similar laws / regulations