Pontiac 400ci Hypereutectic Pistons Solid Dome 10cc +060

Name: Pontiac 400ci Hypereutectic Pistons Solid Dome 10cc +060
Brand: UNITED ENGINE MACHINE
SKU: 648-KB422.060
Price: 502.16 USD
Availability: InStock

^$502¹⁶

Ships on 09/09/2026

Lowest Price Guarantee

Pontiac 400ci

Solid Dome

Solid Dome 10cc
4.180" Bore (+.060'')
Use w/6.630'' Connecting Rod & 3.750'' Crank Stroke
Comp. Ratio: 9.4:1/100cc
8/pkg

Note: Designed to work with 1967 and later 14-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: 4.180'
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
Solid Dome Top: 10.0cc 2 Valve Reliefs
Intake Valve Relief: 0.239" Depth / 2.140" Diameter
Exhaust Valve Relief: 0.239" Depth / 2.140" Diameter
Top Landing Height: 0.300'
Ring Grooves: 5/64' Top; 5/64' Middle; 3/16' Bottom
Gram Weight: 582/163
Compression Ratio: 9.4:1 w/100cc Combustion Chamber Heads

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.

Features:

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