- Alloy: Hypereutectic 390
- Bore: 4.040''
- Crankshaft Stroke: 3.580''
- Connecting Rod Length: 6.123''
- Deck Height: 9.599''
- Compression Height: 1.675''
- Pin Size: .9842''
- Pin Location: Centered
- Dome Top: -1.2cc 2V Relief
- Intake Valve Relief: 0.366'' Depth / 2.200'' Diameter
- Exhaust Valve Relief: 0.366'' Depth / 2.200'' Diameter
- Top Landing Height: 0.275''
- Ring Grooves: 5/64'' Top; 5/64'' Middle; 3/16'' Bottom
- Gram Weight: 524/132
- Compression Ratio: 11.8/62cc; 11.5/64cc; 10.9/68cc; 10.5/72cc
- Notes: Pistons may protrude on 1992 and up Magnum truck blocks.
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.
- 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
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