This is the high RPM version of our 24v (1998-2017) 103# spring. Triple Shot peened and stress relieved. If you are running over 4,500 rpm and have a cam with over .320? lobe lift, then I suggest these springs with light retainers. Titanium for cams with over .370? lift.
As a precautionary measure, please inspect titanium retainers after every season for wear.