Originally Posted by pfb
Suurreee they do....
If I was rebuilding a very high mileage RFS motor, might I upgrade the valves? sure. But to state that 06 - 07 RFS engines have "extra soft" unusable oem valves is just plain silly.
+1 My 05 had 125hrs and had adjustment room on the intakes. As above, if I was doing the piston/rings I would drop in Ti valves, but otherwise just keep them adjusted and ride......