Check the listing for details. FEULING 2010-2015 Harley-Davidson FLSTFB Fat Boy Lo FEULING ADJUSTABLE PUSH RODS. Condition: New. Listed at 199.95 USD. FEULING 2010-2015 Harley-Davidson FLSTFB Fat Boy Lo FEULING ADJUSTABLE PUSH RODS R ACE SERIES 4070. The vendor part number is 4070. Read title careful to know what you are getting. Catalog decription… • Maintain maximum valve lift! • Increased stiffness and column rigidity maximizing valve-train stability, increasing engine RPM horsepower and torque output. • Tapered 7/16 4130 chrome moly adjustable pushrods, use a minimal adjustment parameter eliminating flex and loss of valve train-stability problems associated with most adjustable pushrods. • Individual length intake & exhaust pushrods keep the adjustment extension to a minimum • Designed to exceed the needs of performance engines using larger lift camshafts and high spring pressures, while maintaining proper and critical oil flow to top end valve gear. • CNC machined with 32 thread per inch adjustment, Double jam nut lock system, RACE SERIES® wall thickness .120- recommended when extreme spring pressures are used • Designed for use with hydraulic or solid lifters and street or race engines • These pushrods require removal of rocker covers and rocker arm supports