Last year I put 2500 on my srx..never cleaned the valves..never cleaned it when bought it with 2200 on it "never checked" so guess what I found.???? I know need three valves... the cables pulled right out of the valves...question is can I run this thing with the valves in the dwn position all the time...until I replace the valve...last trip in canada I'm sure they didn't work and I clocked 1000 miles....how much of a port timing change is there????? can't hurt it with them down all the time will it...I know it will rob some hp but how much... the only other question I would have is heat on the valve...give me you thoughts just want to know..I know I will have to cave and buy them just trying to put it off.. 
