Bobbo76

Casual User
Jan 17, 2019
46
59
VetteCoins
1,231
Car
2002 Corvette Z06
Province
NS
Hey everyone. I had an “upgraded trunnion” failure which led to an almost complete engine failure. So I’ve done what any financially responsible adult would do. Take every spare penny and blow it all on a build.
I’ll post some of my finds, lessons learned and 😩moments. I’ll start with the culprit.
*this thread may contains suggestions of unimaginable violence and new levels of course language*
 

Attachments

  • 6D566A4E-B948-40AA-A152-6D7316848B15.jpeg
    6D566A4E-B948-40AA-A152-6D7316848B15.jpeg
    316 KB · Views: 46
  • 95B3DA02-822F-4F2F-985A-432C16B03A1C.jpeg
    95B3DA02-822F-4F2F-985A-432C16B03A1C.jpeg
    324.5 KB · Views: 44
  • EAD4D7EB-6F95-49CF-B256-522186605EE3.jpeg
    EAD4D7EB-6F95-49CF-B256-522186605EE3.jpeg
    329.4 KB · Views: 39
  • B0C0E4DC-BE99-4680-A82F-D63B06AD0186.jpeg
    B0C0E4DC-BE99-4680-A82F-D63B06AD0186.jpeg
    315.4 KB · Views: 39
  • A99E3A31-E501-41CC-9478-2FB67533C0EE.jpeg
    A99E3A31-E501-41CC-9478-2FB67533C0EE.jpeg
    241.9 KB · Views: 36
  • 478FC5B9-0A5D-4FC8-9905-57C1B3E77751.jpeg
    478FC5B9-0A5D-4FC8-9905-57C1B3E77751.jpeg
    289.5 KB · Views: 27
  • 10360DD3-A272-4F99-BDD8-EBA955D1A0BA.jpeg
    10360DD3-A272-4F99-BDD8-EBA955D1A0BA.jpeg
    275.6 KB · Views: 21
  • 0C1A98D1-71FB-4475-A876-57E3EE57F9F7.jpeg
    0C1A98D1-71FB-4475-A876-57E3EE57F9F7.jpeg
    431.6 KB · Views: 21
What happened to the trunnion? Loose a needle bearing or something?

Hey everyone. I had an “upgraded trunnion” failure which led to an almost complete engine failure. So I’ve done what any financially responsible adult would do. Take every spare penny and blow it all on a build.
I’ll post some of my finds, lessons learned and 😩moments. I’ll start with the culprit.
*this thread may contains suggestions of unimaginable violence and new levels of course language*
 
So that was the start of it. This was followed by the issues with the block. The block had been bored previously and it was suggested by many that because of the boost levels the sleeve integrity would likely be sub par. My builder apparently had the perfect replacement.
With this level of comfort in mind I started ordering.
HAPPY BDAY TO ME!
The pistons went to the shop and the bored in the “new to me” block were carried out.
Yay!!!!
 

Attachments

  • BACEF228-8AF8-4D29-A723-31EBFD904A2A.jpeg
    BACEF228-8AF8-4D29-A723-31EBFD904A2A.jpeg
    432.2 KB · Views: 37
  • 82716B31-4D8B-4D46-8A8B-39CE21DA16C6.jpeg
    82716B31-4D8B-4D46-8A8B-39CE21DA16C6.jpeg
    401.8 KB · Views: 36
  • 3D1CFFA8-0D8E-4772-92CB-E2DE6E727FCC.jpeg
    3D1CFFA8-0D8E-4772-92CB-E2DE6E727FCC.jpeg
    544.2 KB · Views: 35
  • 6C0CEF8A-D8B7-428C-B5C0-78CC5471CC2F.jpeg
    6C0CEF8A-D8B7-428C-B5C0-78CC5471CC2F.jpeg
    287.6 KB · Views: 37
  • D48DEA99-911F-451A-88DC-76D2AC137426.jpeg
    D48DEA99-911F-451A-88DC-76D2AC137426.jpeg
    322.8 KB · Views: 34
  • 4A8DD4DE-0767-45EB-99B0-B949E044F5E2.jpeg
    4A8DD4DE-0767-45EB-99B0-B949E044F5E2.jpeg
    511.4 KB · Views: 26
  • Love
Reactions: ddgermann
So at this point you might be thinking “WOW! This is going great! This guy is gonna have an animal!”
*stand by for searing rage followed by cries of desperation*
So I go pick up my beautiful clean and machined block and start setting ring gaps and checking bearing clearances. This is where it gets ugly.
Not only did I find two head stud bores cracked but the block wasn’t even close to being correct. It was an early LS1 block.
 

Attachments

  • 48CC2AD1-43CF-4979-B48B-9A0344688A31.jpeg
    48CC2AD1-43CF-4979-B48B-9A0344688A31.jpeg
    453.8 KB · Views: 38
  • D0901C31-D771-4E39-A134-9AA650278A77.jpeg
    D0901C31-D771-4E39-A134-9AA650278A77.jpeg
    349.3 KB · Views: 39
  • DD8E7499-B560-4D74-A402-7BEBC0004412.jpeg
    DD8E7499-B560-4D74-A402-7BEBC0004412.jpeg
    416 KB · Views: 41
  • 2BFD177D-5BD9-467D-BAB5-60105A7DA796.jpeg
    2BFD177D-5BD9-467D-BAB5-60105A7DA796.jpeg
    580.2 KB · Views: 47
What happened to the trunnion? Loose a needle bearing or something?
I'll post some pictures shortly. What happened was the material in the trunnion(s) is of insufficient quality and wore. The wear led to a failure of the bearing case which broke off and the pieces were found in the pan. One possibly two needles were missing and never found.
I was doing some 1/2 mile drag racing and noticed a "low oil pressure" on my last run. Everything just went to s**t from there.
 
So at this point you might be thinking “WOW! This is going great! This guy is gonna have an animal!”
*stand by for searing rage followed by cries of desperation*
So I go pick up my beautiful clean and machined block and start setting ring gaps and checking bearing clearances. This is where it gets ugly.
Not only did I find two head stud bores cracked but the block wasn’t even close to being correct. It was an early LS1 block.


That’s exactly what I was thinking.
So a new block to go with all those new parts...
this engine will be an animal when you’re done. And you will know it’s totally done right. $$$

Excellent thread man. Sucks to be going through this but you likely woke up a few guys thinking of a quick upgrade or repair on an engine.

Look forward to seeing this one back together. 👍
 
I'll have a spare LS6 block that will be great for an NA build, a magnafluxed, ground and polished crank and a few other bits.
Just need a damn block.
I'm still learning the LS genealogy. I'm trying to find out which casting numbers I can use without sacrificing any qualities.
So far I think I can use casting numbers 12561166, 12561168 and 12559862
 
Here are the pictures of the failed trunnion. I haven’t disassembled the rest but it’s safe to assumed there will be more.
The first one is the new kit I’ll be using.
 

Attachments

  • C8A0F296-7942-4918-BD3E-7F33B53C66DE.png
    C8A0F296-7942-4918-BD3E-7F33B53C66DE.png
    60.7 KB · Views: 32
  • F6900C4E-ED38-455D-B52E-4A57FFF32C3C.jpeg
    F6900C4E-ED38-455D-B52E-4A57FFF32C3C.jpeg
    231.8 KB · Views: 32
  • 0FCFC4DA-8599-45AC-9CC2-922C5863E4C4.jpeg
    0FCFC4DA-8599-45AC-9CC2-922C5863E4C4.jpeg
    279.9 KB · Views: 31
  • 71CAAD1F-DECB-462F-A0CB-1C024762EEB5.jpeg
    71CAAD1F-DECB-462F-A0CB-1C024762EEB5.jpeg
    250.7 KB · Views: 37
  • Like
Reactions: Rruuff Day
Also I like a tight ass so picked this up as an economical alternative to the pfadt kit.
 

Attachments

  • 17836C47-4CAC-4596-9E1D-F58F58876833.jpeg
    17836C47-4CAC-4596-9E1D-F58F58876833.jpeg
    308.4 KB · Views: 35
Last edited:
  • Like
Reactions: Hotrodron
Here are the trunnions. Easy to see the wear. For some reason drivers side (first picture) is worse than the passengers side.
 

Attachments

  • 96649D5A-B7A4-4D63-968A-93013354DBF6.jpeg
    96649D5A-B7A4-4D63-968A-93013354DBF6.jpeg
    423 KB · Views: 36
  • 814D3CF7-0D00-44E5-8F25-41E325B83CA2.jpeg
    814D3CF7-0D00-44E5-8F25-41E325B83CA2.jpeg
    391.3 KB · Views: 27
Old Thread: Hello . There have been no replies in this thread for 100 days.
Content in this thread may no longer be relevant.
Perhaps it would be better to start a new thread instead.

Users who are viewing this thread