buddy of mine got these on 2 limited sportsman dirt motors an the aluminum ones on 2 back up motors,..constantly turning 7800 rpm 2 nights a week with no issues,..lifetime guarantee!!
on about a 620 lift solid tappit cam on a high banked 1/2 mile dirt oval,..stanless on 2nd season,..aluminums was ran for 4 seasons before set aside as spare motors...
