KPMI, valve spring kit. .655" lift. Steel top collars - 84-99 Evo B.T.; 99-04 Twin Cam; 86-03 XL (NU) 971491 230 GSM 47% cotton 30%

230 GSM 47% cotton 30% recycled polyester 21% acrylic 2% elastane

For 3-7/16" & 3-1/2" standard bore

If you're into a set of new gear driven performance cams

Many of the old style 4-speed kickstart parts are used for easy access to replacement parts

KPMI, valve spring kit. .655" lift. Steel top collars - 84-99 Evo B.T.; 99-04 Twin Cam; 86-03 XL (NU) 971491 230 GSM 47% cotton 30%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.