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Racing Spring Kit, 0.600" Lift, HD® Shovelhead 80", 1978-1983

Racing Spring Kit, 0.600" Lift, HD® Shovelhead 80", 1978-1983


Regular price $147.66 USD
Regular price $147.66 USD Sale price $147.66 USD
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Retainer Material

California Prop 65

All KPMI® retainers are designed using the latest CAD software available. Further, the retainers are tested using finite element analysis (FEA) to ensure the retainer can endure high stress levels during operation. By using billet aircraft alloy material, heat treating it, and then employing our high powered design software, KPMI® is able to maximize weight saving by incorporating a series of drilled holes in the retainers. These retainers are both strong and light, allowing significant reduction to overall valvetrain mass, which is known to improve performance.

Installation Instructions Click Here for 20-21100
Click Here for 20-21150
Type Intake/ Exhaust
Retainer Material H.A. 7075-T6 or H.T. Steel
Valve Lift 0.600"
Installed Height 1.510"
Seat Pressure 152#
Open Pressure 387#
@ Lift 0.600"
Note This basewasher is counterbored allowing for a 0.720" outside diameter seal to sit inside the base for additional seal to retainer clearance.
Unique Identifier No. FR327789_01GAUS
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