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Vehicle Info NeededUNITED ENGINE MACHINEPART NUMBER: 648-KB315.STD
Ford 351W Hypereutectic Pistons Flat Top
$43011
Ships on 09/04/2026
Lowest Price GuaranteeFord 351WFlat Top Pistons
Ford 351W Hypereutectic PistonsFlat Top 4.000'' Bore (Standard) Use w/5.956'' Connecting Rod & 3.500'' Crank Stroke Comp. Ratio: 12.5/55cc; 11.7/60cc; 11.1/64cc; 10.5/69cc 8/pkg
Technical Specs:
- Alloy: Hypereutectic 390
- Bore: 4.000'
- Crankshaft Stroke: 3.500'
- Connecting Rod Length: 5.956'
- Deck Height: 9.500'
- Compression Height: 1.774'
- Pin Size: 0.9122'
- Pin Location: Centered
- Flat Top: 0cc
- Intake Valve Relief: N/A
- Exhaust Valve Relief: N/A
- Top Landing Height: 0.217'
- Ring Grooves: 5/64' Top; 5/64' Middle; 3/16' Bottom
- Gram Weight: 517/107
- Compression Ratio: 12.5/55cc; 11.7/60cc; 11.1/64cc; 10.5/69cc
- Notes: Pre 71 blocks .020 shorter, not enough stock to clean up. Designed for Ford Sportman "N" head.
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 pistons are 100% CNC machined and T-6 heat treated from 16%-18% silicon 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.
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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 Ford Pistons
BrandUNITED ENGINE MACHINE
Package Height5.3
Package Width9.9
Package Length22.2
Weight15.02 PG
Part CategoryPerformance Parts
Part FitmentSemi Universal
Vendor Part NumberKB315.STD
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
