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    Results 1 to 5 of 5
    1. #1
      Join Date
      Oct 2018
      Location
      Central Illinois
      Posts
      4

      Need help figuring out how this valve got bent like this

      I am not the most experienced engine guy in the world but I can't figure out how this could of happened.



      LS7 Dry sump
      C5R block
      All pro heads

      I had been fighting backfiring issues and poor performance for 4 years. I replaced the plugs, removed the remote coils and installed new ones, removed the Harrop intake and put a stock unit back on, re-tuned the engine multiple times, replaced the plug wires and removed the valve covers to inspect the springs. After 4 years of hell I pulled the engine and had it opened up. One of the valves was bent where you would expect it to be bent. But this valve was bent about an inch from the top.

      Any ideasNeed help figuring how this valve (exhaust) got bent like this
      Attached Images Attached Images


    2. #2
      Join Date
      Jul 2006
      Location
      Pensacola, FL
      Posts
      1,263
      Country Flag: United States
      Any witness marks on that piston?

    3. #3
      Join Date
      Oct 2018
      Location
      Central Illinois
      Posts
      4
      No witness marks anywhere
      2 valves were bent
      One towards the bottom and this one in the spring area.

    4. #4
      Join Date
      Apr 2001
      Location
      The City of Fountains
      Posts
      15,971
      Country Flag: United States
      I can't imagine a valve being bent unless it kissed a piston...Maybe improper rocker geometry?

      Andrew
      1970 GTO Version 3.0
      1967 Cougar build
      GM High-Tech Performance feature
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      Dr. EFI
      I deliver what EFI promises.
      Remote Holley EFI tuning.
      Please get in touch if I can be of service.

      "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her

    5. #5
      Join Date
      Oct 2018
      Location
      Central Illinois
      Posts
      4
      So far the best I can guess for the bend is it was improperly installed and the guide somehow bound up the valve and bent it.





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