Triumph "Cast Iron Head" Pre-Unit Twins Valve Spring Set (1) - 99-3700 Tiger Norton Commando 750 & 850

Norton Commando 750 & 850 models including Atlas

Well this is Exactly you need

It does not contour the valve very well which "digs" into the valve stem and over time causing your valve stem to wear prematurely

Sleeved Nut Features a "BSF" Thread pitch

they are different lengths to accommodate US & UK spec bars

Triumph "Cast Iron Head" Pre-Unit Twins Valve Spring Set (1) - 99-3700 Tiger Norton Commando 750 & 850We are now stocking a new Hepolite valve spring kit for early Triumph pre unit twins that feature a "cast iron head". This is a new quality spring kit ready to be installed Fits Triumph 350 & 500 Pre Unit Twins from 1952 1956. Also fits Triumph 650 Pre Unit Twins (Thunderbird, 6T, Bonneville, T120, Tiger, TR6 & T110) from 1952 1956. Please refer to your parts catalog for proper fitment. Please note that our valve springs are sold in a set as pictured