[ted]

Besides the pushrod being too short and creating some extreme leverage issues when the valve starts to open, two other things come to mind for the Dove (and similarly designed) aluminum rocker arms. The first is the age. Ten years of use is what I see as the limit before the rockers are 'fatigued' and just simply break. The other is side clearance. If the side clearance is inadequate, then when the rocker heats up and expands this creates a significant drag at the sides and puts it in a bind. I like a minimum of 0.030" of sideplay for the rockers.

I ran the bronze bushed aluminum rockers many years ago and had breakage issues from the start when using them with roller valve spring pressure requirements. I subsequently went with the Dove's and that particular issue went away but the breakage issues resurfaced when the rockers got several years worth of running on them. Just food for thought.