NO DISCOUT ON CUSTOM VALVES

Made of special stainless steel alloy.  Weight 84g.  This is 17g lighter than 9x45 valve.  Use lighter spring pressure and increase HP.

According to Jim K's research these 2mm oversize intake valves with 8mm stems greatly improves the flow over the  9mm stem 1mm oversize.

• This 1mm smaller stem increases flow
• These 46mm diameter valves overlap the stock 45.35mm seats about .017". Leaving this wider margin over lapping the 45 degree seating ring is a very important feature.  The flow at low lift is greatly enhanced for low end power.  
• When worn seats need replacement, we have special alloy oversize racing seats.  See Part #605-79204-1 
• Use only retracted tip spark plugs with this 2mm oversize valve.

For more information on valve sizing and cylinder head performance get a copy of The Alfa Romeo Engine High Performance Manual by Jim Kartalamakis, Veloce Publishing.