Made in the USA Require machining of valve guides. Require machining of valve guides. Upper Collars Lower Collars & Seals. The item "650 Lift Titanium Valve Spring Kit by Kibblewhite Harley Evo Big Twin Sportster" is in sale since Sunday, October 15, 2017. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Engines & Engine Parts\Other Engines & Engine Parts".The seller is "dealerdave" and is located in Harleysville, Pennsylvania. This item can be shipped worldwide.