Manley titanium valve spring retainers are a great way to lighten your valve train in order to rev higher and make more power. They're manufactured from special heat-treated 6AL 4V titanium alloy, selected to deliver maximum strength and reliability. These retainers are excellent for all types of racing, and are designed for valve stem locks with a 10 degree taper.
Retainers work with Manley valve spring numbers #221447, #221448, #221449, #221450, #221451, and #221461. Retainer dimensions are outside diameter of outer spring 1.660", outside diameter of middle spring 1.185", and inside diameter of inner spring 0.620". Retainers are sold in a set of sixteen.