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Vehicle Info NeededUNITED ENGINE MACHINEPART NUMBER: 648-PRJ100-3
Spiro-Lox Wrist Pin Lock Rings .927" Dia. x .020" Thick
$114
4 left in stock
Ships on Oct 12, 2026
Lowest Price GuaranteeLock Rings
- Spiro-Lox Wrist Pin Lock Rings
- .927'' Dia. x .020'' Thick
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.
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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 Wrist Pin Lock Ring
Product LineUEM Pistons KB Signature Series Hypereutectic Small Block Chevy Pistons
BrandUNITED ENGINE MACHINE
Package Height0.1
Package Width0.9
Package Length0.9
Weight0.01 PG
Part CategoryPerformance Parts
Wrist Pin Retainer Outside Diameter1.008 in (25.603 mm)
Part FitmentSemi Universal
Wrist Pin Retainer Thickness0.071 in (1.803 mm)
Vendor Part NumberPRJ100-3
Package Qty1
Package TypeEA
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