Keith Black Pistons Dome Top Pistons KB297.020 for Big Twin 1978-1984
$597.31
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Keith Black Pistons Dome Top Pistons KB297.020 for Big Twin 1978-1984
$597.31
These Keith Black dome top pistons are precision-engineered for Harley-Davidson Big Twin 1978-1984 models equipped with a 1340cc Shovelhead engine. Crafted from a premium hypereutectic alloy containing 16% silicon, they offer exceptional durability and thermal stability for demanding air-cooled motorcycle applications.
Featuring a low thermal expansion rate, these pistons allow for tighter piston-to-cylinder operating clearances to reduce noise and optimize power transfer. Each complete replacement kit comes equipped with two pistons, matching rings, wrist pins, and spiral locks to replace OEM # 21992-80.
Key Features
| Brand | Keith Black Pistons |
| Manufacturer Part Number | KB297.020 |
| Product Type | Dome Top Pistons |
| Material | Hypereutectic Alloy (16% Silicon) |
| Bore Size | 89.4 mm |
| Stroke | 108 mm |
| Compression Ratio | 8.3:1 (with 117cc Head Chamber Volume) |
| OEM Replacement | 21992-80 |
| Engine Compatibility | 1340cc Shovelhead |
| Product Weight | 1.8 kg |
Highlights
- Cast from 16% silicon hypereutectic alloy for high strength and minimal thermal expansion
- Enables tighter cylinder wall clearances for quieter, more reliable engine operation
- Direct replacement for OEM # 21992-80
- Achieves an 8.3:1 compression ratio with standard 117cc combustion chambers
Compatibility
Compatible with Harley-Davidson Big Twin models from 1978 to 1984 featuring a 1340cc Shovelhead engine.
What's included
- 2 x Keith Black Hypereutectic Dome Top Pistons
- 1 x Piston Ring Set
- 2 x Wrist Pins
- 4 x Retaining Clips
Downloads
Frequently asked questions
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