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SB400 carnage pics

Discussion in 'The Garage' started by mountainexplorer, Mar 6, 2005.

  1. mountainexplorer

    mountainexplorer 1/2 ton status

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    [​IMG]
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  2. Cricket

    Cricket 3/4 ton status

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    The horror..............the horror....................the horror......

    Damn Allan, that looks brutal.
     
  3. mountainexplorer

    mountainexplorer 1/2 ton status

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    And more pics:
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    Think I could JB weld this back into the cylinder wall?
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  4. 85mudblazin

    85mudblazin 1/2 ton status

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    Wheres the story?? :)
     
  5. mikey_d05

    mikey_d05 1 ton status GMOTM Winner

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  6. Shaggy

    Shaggy 3/4 ton status

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    Yow, I bet that sounded ugly when it let go!:crazy:
     
  7. mountainexplorer

    mountainexplorer 1/2 ton status

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  8. mountainexplorer

    mountainexplorer 1/2 ton status

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    It sounded like someone dropped a bunch of bolts into the motor all of a sudden, and about 4 seconds after that it shut itself off. That was it. No exaggerations. It was done and over with before I could push the clutch pedal down all the way.
     
  9. Silver84k5

    Silver84k5 1/2 ton status

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    and that was all from detonation?

    you did a number on that thing man
     
  10. diesel4me

    diesel4me 1 ton status Premium Member

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    Autopsy results--CSI for DOA 400

    A moment of silence for our fallen 400 small block--another of chevys rather rare and best motors passes into oblivion--R.I.P. :frown1: :frown1: :frown1:

    Not making fun of your misfortune--I hate it when a chevy motor blows up,and its frustrating to not know what caused it--after a catostrophic failure like this its kinda hard to pin down the exact cause...so many parts get wiped out in a few seconds at 2000+rpm its nearly impossible to say which failed first and started the chain reaction that finished it off...

    How many peices was the camshaft in??--I saw a new chevy citation years ago that spit a 3 inch section of the cam ,with 2 lobes,out the side of the block.and it actually kept running long enough for the owner to bring it to the dealership my brother worked at--it blew up and seized as they were driving it into the service area --the lifters must not have fell in after the cam broke right away,but at least one fell in during the trip to the service bay,and that was its last revolution!--Your cam might have snapped in 2 places and let the lifters fall into to path of the connecting rods,and BBLLLAAATTTT!!!---no more 400...:frown1:

    I hope you can salvage the crank to use in a 350 stroker motor--looks like the heads are toast(or at least need a valve job if they arent cracked)--I havent seen a cam push the expansion plug out the back like yours did(or did you do that?)--my condolances on your loss--I know how it sucks to spend time and money on something,then have it not pan out like you hoped,been there,done that....:crazy:
     
  11. TrcksR4ME

    TrcksR4ME 1/2 ton status

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  12. k10clown

    k10clown Registered Member

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  13. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    That is correct. Anymore than .030 on a 400 and you can run into problems with them. Detonation is hard to fight with a 400 block because of their design, the cylinder temps are hotter than a 350 block. I've faught and faught detonation with mine and have to run 91 oct. and octane booster with a 9.2:1 motor if I am going to tow with it. I've come to the conclusion that aluminum heads for a 400 are a GREAT idea to help fight high cylinder temps. If/when I build another 400 I will definantly use aluminum heads, heck my current 406 may have alums before it's all over.

    Regardless....I'll stil take a 406 over a boring 350 anyday. :D
     
  14. big_truxx

    big_truxx 1/2 ton status

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    Dude that really blows!!!


    I think I will stick with building off a 350 block to start. I like their waterjackets much better :waytogo: and so so so versitile. you can really build everything you need off that block. 383 torquer or a long (6.5") rod 302 for road racing :D and still use the same block.
     
  15. mountainexplorer

    mountainexplorer 1/2 ton status

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    New Theory:

    After taling with a friend, here's the latest theory as to the cause.

    The cam broke first. This allowed the #8 exhaust valve to hit the piston, shattering it and breaking off the head of the valve. Pieces of the piston then were sent all through the motor, and allowing the rod and wristpin to break out the section of the cylinder wall at the same time the 3 lifters and pushrods drop into the pan. Engine shuts down.

    I never verified 100% that it was a true Comp 292 cam. There are no Comp numbers on the back of it. Maybe a regrind?
     
  16. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    With a degree wheel and a dial indicator you can figure out exactly what the specs of your cam are.


    Hitting the nos again eh? :grin:
     
  17. dontoe

    dontoe 3/4 ton status GMOTM Winner

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    Makes me teary eyed. So much effort and money!:(
     
  18. MTMike

    MTMike 1/2 ton status

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  19. mountainexplorer

    mountainexplorer 1/2 ton status

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    Not much money. Just alot of trading. I had less than $100 in cash into the motor, but alot of wheeling and dealing over a year to round up all the good parts I wanted.

    Looks like the cam might be a Crane Cam. Had someone come look at it and he thinks it's possobly a Crane. Its not a regrind. And it broke in two spots. I found the 3rd piece in the oil pan after we extracted the back section out of the block and noticed there was a chunk still missing.

    Still unsure as to why it would have snapped so suddenly.
     
  20. big_truxx

    big_truxx 1/2 ton status

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    This also puzzled me. I did not think that cams would just come apart like that. I am also still learning though. :D
     

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