Keith Black Pistons Dome Top Pistons KB297.030 for Big Twin 1978-1984
$597.31
Skip to product information
Keith Black Pistons Dome Top Pistons KB297.030 for Big Twin 1978-1984
$597.31
Engineered for air-cooled performance, Keith Black Dome Top Pistons are cast from premium hypereutectic alloy with a 16% silicon content. This advanced composition provides a low thermal expansion rate, allowing for tighter piston-to-cylinder operating clearances and superior thermal stability in vintage motorcycle engines.
Designed to deliver an 8.3:1 compression ratio with 117cc head chamber volume, this kit directly replaces OEM # 21993-80. Each complete set includes two pistons, rings, wrist pins, and clips for a thorough and reliable top-end rebuild.
Key Features
| Brand | Keith Black Pistons |
| Product Type | Pistons |
| Model Number | KB297.030 |
| Bore Size | 89.6 mm |
| Stroke | 108 mm |
| Piston Top Style | Dome Top |
| Material | Hypereutectic 390 Alloy (16% Silicon) |
| Compression Ratio | 8.3:1 (with 117cc chamber volume) |
| OEM Replacement Number | 21993-80 |
| Oversize | +0.030 in |
| Product Weight | 1.2 kg |
Highlights
- Cast hypereutectic 16% silicon alloy for low thermal expansion
- Allows tighter piston-to-cylinder clearance in air-cooled engines
- Delivers 8.3:1 compression ratio with 117cc cylinder head chambers
- Direct replacement for OEM # 21993-80
Compatibility
Fits Harley-Davidson Big Twin models from 1978 to 1984 equipped with a 1340cc Shovelhead engine.
What's included
- 2 x Keith Black Hypereutectic Dome Top Pistons
- 1 x Set of Piston Rings
- 2 x Wrist Pins
- 4 x Pin Clips
Downloads
Frequently asked questions
|