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Spring Set, Cr-Si, Intake/ Exhaust, 0.600" Lift, Various HD® Applications

Spring Set, Cr-Si, Intake/ Exhaust, 0.600" Lift, Various HD® Applications


Regular price $64.50 USD
Regular price $64.50 USD Sale price $64.50 USD
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California Prop 65

Harley-Davidson® Shovelhead 74" 1966-1977
Harley-Davidson® Shovelhead 80" 1978-1983

Replacement springs for KPMI® High Performance 0.600" lift 74" and 80" Shovelhead kits 20-2110, 20-21100, 20-21150, 20-20445, and 20-20450. Also, these springs are the same as SIFTON PN. 3030.

All KPMI® valve springs are designed in house using sophisticated, proprietary design and simulation softwares. Our engineers, software, and 79 years of experience enable us to determine critical characteristics including stress, natural frequency, system harmonics, and fatigue life. Our spring manufacturing partners are U.S based companies that are ISO certified. The Super-Clean Chrome-Silicon valve spring wire we use is traceable back to Kobe Japan where some of the best spring wire in the world is manufactured. Each spring goes through a rigidly controlled heat treatment, stress relief, and shot peening process. Combining our design, simulation, and manufacturing protocols with this premium quality valve spring wire allows KPMI® to supply you with the best possible valve springs period!

See Specifications below for more information and reference part numbers.

Type Intake/ Exhaust
Material Chrome Silicon
Pkg. of 4
Valve Lift 0.600"
Installed Height 1.510"
Seat Pressure 152#
Open Pressure 387#
@ Lift 0.600"
Outer Spring ID 1.249”
Inner Spring ID 0.975”
Solid Height 0.850"
Same as Sifton P/N 3030
Note Achieving the recommended installation height may require KPMI® retainer 20-4248, which is offset 0.070” compared to OEM.
Unique Identifier No. FR327789_01GAUS
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