KPMI Black Diamond Intake Valve 20-4171R for Harley-Davidson Evo 1984-1999
$52.00
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KPMI Black Diamond Intake Valve 20-4171R for Harley-Davidson Evo 1984-1999
$52.00
KPMI Black Diamond stainless steel intake valves are engineered for exceptional strength, reduced friction, and superior wear resistance compared to standard chrome and nickel plating. Each one-piece forged valve undergoes a specialized German treatment process that enhances durability and provides outstanding resistance to corrosion.
Designed using advanced Finite Element Analysis software and proven on computerized flow benches, these lightweight valves feature optimized racing profiles that deliver superior flow characteristics. Designed specifically for 1984–1999 Harley-Davidson Evolution engines, this oversize intake valve ensures reliable high-performance valvetrain operation.
Key Features
| Brand | KPMI |
| Product Type | Intake Valve |
| Material | Black Diamond™ Stainless Steel |
| Coating | Black Nitroneg |
| Head Diameter | 41.4 mm |
| Stem Diameter | 7.9 mm |
| Overall Length | 114.9 mm |
| Tulip Angle | 40° |
| Profile | Oversize (Racing Profile) |
| Quantity | 1 |
Highlights
- One-piece forged stainless steel construction
- Proprietary Black Diamond surface treatment for reduced friction and corrosion resistance
- Finite Element Analysis designed with racing flow profile
- Direct oversize replacement for 1984–1999 Harley-Davidson Evolution engines
Materials & care
Crafted from precision one-piece forged stainless steel with a specialized Black Diamond surface treatment.
Compatibility
Fits 1984–1999 Harley-Davidson Evolution engines.
Frequently asked questions
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