DescriptionAV&V™ Extreme Duty Manganese Bronze Valve GuidesAV&V’s Manganese bronze alloy allows you to fit the valve at a tighter clearance for better heat dissipation and longer life.Tapered & radiused nose for easier installation and better air flow.CNC machinedUnfinished I.D. ready to be reamed with AV&V’s exclusive reamers after installation (see reamers section for more details)Ducati Belt-Drive 2 Valves – 750, 800, 900