Note: High lift camshafts can create unique problems in VW solid lifter cylinderheads. The standard valve stem seal can be struck by the upper valve spring retainer at lifts higher than .430 inches. We recommend using the shorter Teflon seals. On cams with a lift of greater than .430 inches the standard valve springs may bind on solid lifter heads. It is generally recommended that you install sport valve springs when using cams with greater than .430 inches of lift. Be aware that when using cams with greater than .430 inches of lift on some solid lifter heads, it may become necessary to clearance grind each side of the lifter bores to prevent camshaft interference with the cylinder head casting. This requires removal of the head.