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Progressive rate fork springs of superior quality. Precision wound and made of high quality chrome silicon wire. Provides a smooth ride but the progressive rate gets more firm when compressed, which helps prevent bottoming out when taking big bumps but still gives a comfortable ride in normal cruising circumstances. Also helps reduce front end dive during hard braking. Each kit comes with progressive fork springs and spacers where necessary.

PS, fork spring kit. 47 mm

#719716

Stock:Yes

Reduces total valve train mass. Great for racing high lift performance builds. The springs are manufactured from the highest quality clean chrome silicone wire, shot peened and heat treated for maximum fatigue life. Kit includes springs, upper collars, lower collars, and valve keys. Max valve lift: .480". Installed height: 1.310". Seat pressure 158 lbs. Open pressure: 340 lbs. @ .480" valve lift.

Note: Kit must be used with Kibblewhite Precision engineering (KPMI) valve guides. Stock dimensions valve guides must be shortened. Valve guide machining instructions are included with this kit.

KPMI, valve spring kit. .460" lift. Steel top collars

#524452

Stock:Yes

Includes titanium top collars, steel lower, reverse wound multiple parts inner & outer performance spring set, early style oiil seals and a oil seal installer tool. Manley recommends the use of the included earlier style Viton oil seals and not the oil seal-lower collar set-up as used by The Factory. Pressure: 180lbs@1.800", 400lbs@1.150". Coil bind 1.085".

Manley, valve spring kit. Titanium. Std to .650" lift

#501284

Stock:Yes

High performance valve spring kit. Includes steel top collars, lower collars, valve springs and valve keys. Fits stock Knuckleheads, S&S Knucklehead tins and all S&S KN (Knucklehead) style engines.

Note: OEM valve guides may require shortening.

S&S, valve spring kit. STD to .480" valve lift

#531960

Stock:Yes

Installed pressure 217lbs@1.789", open pressure & height 415lbs@1.215", coil bind@1.125". Direct replacement, installs without machining or rocker box clearancing. High tensile chrome silicone wire with a shot-peened heat treatment and a super NexTex® finish. Kits include springs, lower collars, titanium upper collars, shims, keys and Viton® seals.

Feuling, High Load Beehive valve spring kit. .750" lift

#566037

Stock:Yes

Includes titanium top collars, steel lower collars, valve springs and a valve key set. Machining required to lower the valve guide to avoid interference with the top collar. Special 3-spring design with interference fit to reduce harmonics and control spring surge. Springs have more pressure than stock. Pressure: 180lbs - 1.600" / 365lbs -1.100" / 415lbs - .950". Coil bind: .850"

Manley, high lift valve spring kit. .500" to .650" lift

#514001

Stock:Yes

Stock replacement, use 524463 top collar & valve key set

Kpmi, Sportster valve spring set

#524462

Stock:Yes

High lift high pressure spring kit. Reduces total valve train mass. Great for high performance & racing performance builds. The dual springs are manufactured from the highest quality clean chrome silicone wire, shot peened and heat treated for maximum fatigue life. Kit includes dual springs with internal damper to give a wider range of harmonic reduction, upper collars, lower collars, valve keys and seals. Max valve lift: .655". Installed height: 1.810". Seat pressure 185 lbs. Open pressure: 450 lbs. @ .655" valve lift.

KPMI, valve spring kit. .655" lift. Steel top collars

#524513

Stock:Yes

Chromoly, black oxided. Precision re-engineered to offer installation advantages and manufactured of special heat treated chromoly material that has been black oxided. Will fit OEM, Manley and many aftermarket manufacturers valve springs. Replacement for OEM 18220-57.

Manley, lower valve spring collar set

#513781

Stock:Yes

High lift valve spring kit with single beehive style springs. .650" valve lift for stock heads. 1.860" installed height, 178lbs valve seat spring pressure and 376lbs@.650" lift. Maximum 6500 RPM.

S&S, Street Performance valve spring kit. .650" valve lift

#531869

Stock:Yes

Reduces total valve train mass. Great for high lift racing performance builds. The springs are manufactured from the highest quality clean chrome silicone wire, shot peened and heat treated for maximum fatigue life. Kit includes springs, upper collars, lower collars, and valve keys. Max valve lift: .600". Installed height: 1.510". Seat pressure 152 lbs. Open pressure: 387 lbs. @ .600" valve lift.
Note: Does not include valve guide seals.

KPMI, valve spring kit. .600" lift. Aluminum top collars

#524476

Stock:No

Steel upper valve spring collars. Installed spring pressure 165 lbs. Kibblewhite Precision Engineering racing valve spring kit for standard 7mm diameter valve stems. Chrome multiple-parts silicone spring set, steel top collars and steel lower collars. Includes valve seals.

Note: Does not include a valve key set, OEM must be re-used.
Note: See 524994 for replacement valve seals.

KPMI, valve spring kit. .630" lift. Steel top collars

#524645

Stock:Yes

Reduces total valve train mass. Great for high lift racing performance builds. The springs are manufactured from the highest quality clean chrome silicone wire, shot peened and heat treated for maximum fatigue life. Kit includes springs, upper collars, lower collars, and valve keys. Max valve lift: .600". Installed height: 1.510". Seat pressure 152 lbs. Open pressure: 387 lbs. @ .600" valve lift.
Note: Does not include valve guide seals.

KPMI, valve spring kit. .600" lift. Steel top collars

#524595

Stock:No

Steel top collars.
Installed pressure 183lbs@1.760", open pressure & height 380lbs@1.250", coil bind@1.180". Direct replacement, installs without machining or rocker box clearancing. High tensile chrome silicone wire with a shot-peened heat treatment and a super NexTex® finish. Kits include springs, lower & upper collars, shims, keys and Viton® seals. Compatible with stock 7mm diameter valve stems.

Feuling, Econo beehive valve spring kit. .585" lift

#566033

Stock:Yes

Manley, lower valve spring collar set. +.030"

#513787

Stock:No

Manley, lower valve spring collar set. +.030"

#513784

Stock:No

Installed pressure 151 Lbs@1.475" (0.485 Lift), 304 Lbs@0.990" open height, coil bind@0.945". High tensile chrome silicone wire with a shot-peened heat treatment and a super NexTex® finish.
Kit includes springs, lower collars, titanium upper collars, shims, keys and Viton® seals. Fits OEM style 6mm valve stems and triple groove lock.

Note: Bolt-in up to 565" lift. For use on high lift cams only. The increased valve spring loads will create extreme rocker arm deflection with smaller cams.
Note: Cam specs measured on the lifter @ 0.050 lift with 1.61 rocker arm ratio

Feuling, High Load Beehive valve spring kit. .600" lift

#588022

Stock:Yes

Stock style high performance one-piece Beehive spring set. Seat load: 193@1.85". Open load: 373@1.240". Coil bind: 1.150". Rate lbs / inch: 293. compatible with OEM upper and lower collars and high performance applications. Set includes springs only.

JIMS, Beehive valve spring set. 193@1.850"

#978582

Stock:Yes

With titanium upper spring collars.
Installed pressure 134lbs@1.375" (0.405 lift), 103 lbs@1.520" (0.550 lift), coil bind@.920". Direct replacement, installs without machining or rocker box clearancing. High tensile chrome silicone wire with a shot-peened heat treatment and a super NexTex® finish. Kits include springs, lower collars, titanium upper collars, shims, keys and Viton® seals.

Feuling, Endurance Beehive valve spring kit. 565" lift

#588021

Stock:Yes

Must reuse OEM steel upper spring collars.
Installed pressure 134lbs@1.375" (0.405 lift), 103 lbs@1.520" (0.550 lift), coil bind@.920". Direct replacement, installs without machining or rocker box clearancing. High tensile chrome silicone wire with a shot-peened heat treatment and a super NexTex® finish. Kits include springs, lower collars, no upper collars, shims, keys and Viton® seals.

Feuling, Endurance Beehive valve spring kit. 565" lift Re-us

#993530

Stock:Yes