This is interesting. Aren`t Jesel, Harlands and T&D Alum. Been taking my H&S`s past 7000 for years and I know of 8000+ rpm motors w/Alum. rockers.............



I have TONS of passes on my TD alum rockers with
WAY more open pressure.. mine is in the HIGH 800#
and turning 8200 rpm.. they have been in there for
a number of years... you buy cheap. you get cheap..
also I will say they did work to 9600 rpm but I didnt
have any power up high.. too small of a cam at .705 lift