COLLAR:Titanium LIFT:.600” LOCATION:Exhaust,Intake ・Kit contains special tri-springs (outer-intermediate-inner), interference fit to reduce harmonics and control spring surge ・Machining is required to lower the height of the valve guides to avoid interference with top collars;use tool PART #DS-198917 (comes with .375”pilot) ・Thin stem guides require using tool PART #DS-198917 and .3125”or .3437”pilots ・Kit has a .930”coil bind ・Made in the U.S.A.