KPMI Valve Spring Kit 20-20850 for Harley-Davidson Shovelhead 80 1978-1983
$242.00
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KPMI Valve Spring Kit 20-20850 for Harley-Davidson Shovelhead 80 1978-1983
$242.00
This KPMI OEM replacement valve spring kit is engineered to deliver stock operating pressures and work seamlessly with stock camshaft profiles. Designed for Harley-Davidson Shovelhead 80" models from 1978 to 1983, it provides reliable valvetrain performance using premium modern engineering.
Valve springs are precision-wound from heat-treated and shot-peened Super Clean chrome silicon wire. The included H.T. steel retainers, keepers, and bases are developed using finite element analysis to ensure maximum mechanical strength and direct interchangeability with stock components.
Key Features
| Brand | KPMI |
| Manufacturer Part Number | 20-20850 |
| Type | Intake / Exhaust |
| Retainer Material | H.T. Steel |
| Spring Material | Chrome Silicon |
| Maximum Valve Lift | 10.5 mm |
| Installed Height | 34.9 mm |
| Seat Pressure | 129# |
| Open Pressure | 272# |
| Base Washer Note | Counterbored for 18.3 mm OD seal for added retainer clearance |
| Weight | 0.6 kg |
Highlights
- Engineered to factory OEM pressures and specifications
- Heat-treated, shot-peened chrome silicon spring wire
- High-tensile steel retainers engineered via FEA modeling
- Counterbored basewashers to maximize seal-to-retainer clearance
Compatibility
Fits 1978–1983 Harley-Davidson Shovelhead 80" motorcycle engines using stock camshaft profiles.
What's included
- Valve springs
- H.T. steel retainers
- Keepers
- Bases / basewashers
Downloads
Frequently asked questions
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