Pontiac 400 ci Hypereutectic Pistons Flat Top -6 cc [4.150 in. Bore (+.030)]

Name: Pontiac 400 ci Hypereutectic Pistons Flat Top -6 cc [4.150 in. Bore (+.030)]
Brand: UNITED ENGINE MACHINE
SKU: 648-KB133.030
Price: 439.49 USD
Availability: InStock

^$439⁴⁹

Ships on 09/16/2026

Lowest Price Guarantee

Pontiac 400ci

Flat Top

Flat Top -6 cc
4.150 in. Bore (+.030)
Use w/6.630 Connecting Rod & 3.750 in. Crank Stroke
Comp. Ratio: 9.2:1/87 cc
Set of 8

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

Part TypePiston

Product LineUEM Pistons KB Signature Series Hypereutectic Pontiac Pistons

BrandUNITED ENGINE MACHINE

Package Height5.5

Package Width10.5

Package Length19.5

Weight15.2 PG

Part CategoryPerformance Parts

Part FitmentSemi Universal

Vendor Part NumberKB133.030

Package Qty1

Package TypeEA

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Some parts are not legal for use in California or other states with similar laws / regulations

Pontiac 400 ci Hypereutectic Pistons Flat Top -6 cc [4.150 in. Bore (+.030)]

100% CNC Machined Pistons

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