Keith Black Pistons Dome Top Pistons KB297.010 for Big Twin 1978-1984
$597.31
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Keith Black Pistons Dome Top Pistons KB297.010 for Big Twin 1978-1984
$597.31
These high-performance dome top pistons are precision-engineered from a hypereutectic alloy featuring a 16% silicon content. Ideal for air-cooled engines, this material provides a low thermal expansion rate that allows for tighter piston-to-cylinder clearances and optimal operating efficiency.
Designed to deliver an 8.3:1 compression ratio with 117cc head chamber volumes, this complete kit directly replaces OEM 21991-80. Each set comes fully equipped with two pistons, rings, wrist pins, and clips for a comprehensive engine rebuild.
Key Features
| Brand | Keith Black Pistons |
| Manufacturer Part Number (MPN) | KB297.010 |
| Bore Size | 89.1 mm (3.508 in) |
| Stroke | 108 mm (4.250 in) |
| Oversize | +0.010 in |
| Piston Material | Hypereutectic Cast Aluminum Alloy (16% Silicon) |
| Piston Head Type | Dome Top |
| Compression Ratio | 8.3:1 (with 117cc Chamber) |
| OEM Replacement Number | 21991-80 |
| Engine Compatibility | 1340cc Shovelhead Engine |
| Product Weight | 1.8 kg |
Highlights
- Cast hypereutectic alloy with 16% silicon content for minimal thermal expansion
- Allows tighter piston-to-cylinder operating clearances
- Engineered specifically for optimal performance in air-cooled applications
- Yields an 8.3:1 compression ratio with 117cc combustion chambers
Compatibility
Fits Harley-Davidson Big Twin models from 1978 to 1984 equipped with a 1340cc (80ci) Shovelhead engine. Direct replacement for OEM part #21991-80.
What's included
- 2 x Keith Black Hypereutectic Pistons (+.010")
- 1 x Complete Set of Piston Rings
- 2 x Wrist Pins
- 4 x Pin Clips
Downloads
Frequently asked questions
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