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Vehicle Info NeededUNITED ENGINE MACHINEPART NUMBER: 648-KB246.040
Ford 347ci Hypereutectic Pistons Flat Top
$41321
8 left in stock
Ships on Sep 08, 2026
Lowest Price GuaranteeFord 347ciFlat Top Pistons Use with Ford 302 Block
- Ford 347ci Hypereutectic Pistons
- Flat Top
- 4.040'' Bore (+.040'')
- Use w/5.400'' Connecting Rod & 3.400'' Crank Stroke
- Comp. Ratio: 11.2/55cc; 10.5/60cc; 10.0/64cc; 9.5/69cc
- 8/pkg
Technical Specs: - For use with Ford 302 Block.
- Alloy: Hypereutectic 390
- Bore: 4.040'
- Crankshaft Stroke: 3.400'
- Connecting Rod Length: 5.400'
- Deck Height: 8.206'
- Compression Height: 1.090'
- Pin Size: 0.9272'
- Pin Location: Centered, 2.5' long. Spacer ring included.
- Flat Top: -6.5cc 2V Relief
- Intake Valve Relief: 0.266' Depth / 2.120' Diameter
- Exhaust Valve Relief: 0.254' Depth / 1.880' Diameter
- Top Landing Height: 0.240'
- Ring Grooves: 1/16' Top; 1/16' Middle; 3/16' Bottom
- Gram Weight: 415/102
- Compression Ratio: 11.2:1 w/55cc Heads; 10.5:1 w/60cc Heads; 10.0:1 w/64cc Heads; 9.5:1 w/69cc 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 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 Height3.7
Package Width9.2
Package Length18.3
Weight10.38 PG
Part CategoryPerformance Parts
Part FitmentSemi Universal
Vendor Part NumberKB PISTON SB-FORD FLAT
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
