Keith Black Pistons Dome Top Pistons KB297.STD for Big Twin 1978-1984
$597.31
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Keith Black Pistons Dome Top Pistons KB297.STD for Big Twin 1978-1984
$597.31
These standard dome top pistons are crafted from high-grade hypereutectic alloy featuring a 16% silicon content, engineered specifically for the demands of air-cooled engines. The low thermal expansion rate allows for tighter piston-to-cylinder clearance, maximizing combustion efficiency and overall engine performance.
Designed to deliver an 8.3:1 compression ratio with 117cc head chamber volume, this kit directly replaces OEM # 21990-80 for reliable engine rebuilding and restoration projects.
Key Features
| Brand | Keith Black Pistons |
| Manufacturer Part Number | KB297.STD |
| Product Type | Dome Top Pistons |
| Bore | 88.8 mm |
| Stroke | 108 mm |
| Material | Hypereutectic Alloy (16% Silicon Content) |
| Compression Ratio | 8.3:1 (with 117cc Chamber Volume) |
| OEM Replacement | 21990-80 |
| Engine Compatibility | 1340cc Shovelhead |
| Vehicle Fitment | Big Twin 1978-1984 |
Highlights
- Cast hypereutectic alloy with 16% silicon content
- Low thermal expansion rate for tighter operating clearances
- Engineered specifically for air-cooled applications
- 8.3:1 compression ratio with 117cc chamber volume
Compatibility
Fits Big Twin 1978-1984 models with 1340cc Shovel engine. Replaces OEM # 21990-80.
What's included
- 2 x Hypereutectic Pistons
- Piston Rings
- Wrist Pins
- Retaining Clips
Downloads
Frequently asked questions
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