Biffle and Earnhardt have mechanical problems during Bristol 500 weekend

  

  
Bristol was not good to the Jack Roush gang. Here Jamie McMurray gets the worst of one tangle (Photo: Getty Images for NASCAR)

  

   By Mike Mulhern
   mikemulhern.net

   BRISTOL, Tenn.
   Engine problems continue to dog the Jack Roush camp, and Dale Earnhardt Jr. had another transmission problem during the Bristol 500 weekend.
    Roush's Greg Biffle blew a motor midway through Sunday's Bristol 500 and finished 39th.
   Earnhardt had to change transmissions before the race and had to start last. He was never a contender. He also had transmission trouble at California a few weeks ago.
   However Biffle ran very strong until his motor let go. "I would have never thought you'd have engine trouble at Bristol," Biffle said. "It never crossed my mind.
   "We were 11th, but had a top-10 locked up easy. And maybe we even had a better car than that.
   "I was just riding around waiting to get to the end.
   "It's probably something in the valve train; that's typically what happens when it drops a cylinder like that."
   Biffle came into the 500 with bruised ribs after slipping and falling on the dock when getting off a fishing boat Tuesday.
   "I feel pretty good," Biffle said after his run. "I feel better now than I have all weekend.
   "I'm sure if you ask me Monday I'm going to be in tremendous pain, I promise you.
   "But there's no problem driving the car, no problem at all."