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  1. #1
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    Well this is a first for me......subtitled "Eagle Down"

    So I took apart a certain 5.7 today that developed a nasty little rod knock on #6 cylinder. Pulled the heads to find the stock .028" head gasket and something I was concerned of had actually happened.




    Yep .....thats right....the piston kissed the head......this is why we don't run .028" quench on a motor. Rod bearing let the piston come up just enough.
    BFNY Performance
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  2. #2
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    Wow...And for a novice like me...this is caused by super high compression on stock head gaskets?
    '14 Mustang GT 5.0...Race Red...6spd Manual...Stock...


  3. #3
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    Sep 2005
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    Hell if its worth a football... kiss away. lol

    Stock catback, and stock drivetrain
    Typing from a tablet, excuse typos.


  4. #4
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    Not really sure what I should be looking at though.

  5. #5
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    Quote Originally Posted by inferno6.1 View Post
    Wow...And for a novice like me...this is caused by super high compression on stock head gaskets?
    No....this is caused by metal on metal contact.

  6. #6
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    Apr 2006
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    Blow it up and trailer it home!!

  7. #7
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    Jul 2008
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    Ouch .. Will those nice new Eagles be ok?

    Arrington Forged 6.1​..ported 5.7 Eagles..HHP Ported Intake
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    11.65@117.3 w/1.61 60' NA--10.68@126.23 w/1.51 60' N20


  8. #8
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    Jun 2008
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    Quote Originally Posted by Higshemi View Post
    Not really sure what I should be looking at though.

    Look at each side of the piston how they look "clean".
    392 based 6.1 PWR heads. 3.06 Getrag, DSS 1400 HP axles
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    Team BFNY Best ET 11.55 w/ 1.55 60' so far...@ Norwalk 4-19-14

  9. #9
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    Ya, noticed that Ben but still don't know enough to be able to tell what happened.

  10. #10
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    that sucks

  11. #11
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    Eric, sorry this happened. Interesting that only cyl #6 was affected. How could the rod bearing allow the piston to impact the head? Was it something that was RPM related? Just curious.

  12. #12
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    Isn't this nick's motor...

  13. #13
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    So how did just one piston kiss the head? What was the ptv clearance ? I thought we wanted .050 to be safe so this wouldn't happen etc
    CAM ONLY RECORD HOLDER 12.34 @108.89 & 1.66 60'
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  14. #14
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    Quote Originally Posted by richierevs View Post
    Eric, sorry this happened. Interesting that only cyl #6 was affected. How could the rod bearing allow the piston to impact the head? Was it something that was RPM related? Just curious.
    no reason to apologize....not my motor. Re Read the first post Richie. He spun a rod bearing....that means the piston will travel further on the worn side of the bearing. With only a .028" window of clearance it doesn't need to go far.

  15. #15
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    Sorry to see. Did it actually break off the electrodes?

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