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Well Zero Compression in 4 and 5

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Cmoe, Apr 6, 2001.

  1. Cmoe

    Cmoe 1/2 ton status

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    2 cylenders are dead

    C'moe

    <font color=black>the blazer is "Back in Black"
     
  2. bigerik

    bigerik 1/2 ton status

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    That sounds expensive, I'm sorry.
     
  3. CaptCrunch

    CaptCrunch 1/2 ton status

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    GAME OVER [​IMG] Sorry to hear that... Blown cylinder head? Time to Upgrade [​IMG]!

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  4. pcorssmit

    pcorssmit 1/2 ton status

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    Unless he has a straight 6, it would have to be two bad cylinder heads. And unless some thing really bad happened (ie overheated the truck really bad), thats kind of unusual.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  5. Blue85

    Blue85 Troll Premium Member

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    Stuck valves then?

    <font color=green>"MAN THOUGHT HURT BUT SLIGHTLY DEAD" --Providence (R.I.) Journal</font color=green>
     
  6. CaptCrunch

    CaptCrunch 1/2 ton status

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    yeah I kinda missed the s key there... I'd check to see what the valves are doing myself... these trucks quite frequently round off the cam lobes... also like was stated stuck valves... maybe time for the new cam, lifters, and some Vortech heads [​IMG].

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  7. pcorssmit

    pcorssmit 1/2 ton status

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    Don't forget a new intake to match those Vortec heads.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  8. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    dont think of this as a bad thing think of it as an upgrade thing lol

    77blazer see it at<A target="_blank" HREF=http://community.webshots.com/user/ssmith6333>http://community.webshots.com/user/ssmith6333</A>[​IMG]
     
  9. HarryH3

    HarryH3 1 ton status Author

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    Wow! So you have one dead cylinder on each side of the engine? That's ugly... [​IMG] Let us know what the results of the autopsy reveal!

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
    It's a great day to be alive...
     
  10. CaptCrunch

    CaptCrunch 1/2 ton status

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    But of course [​IMG]... thinking I'm going to go w/ new TBI to vortech intake... Gotta talk to TPIS and see how much they can modify my chip and what cam... probably will step up to a turbo city bored out TBI unit as well.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  11. Butch

    Butch 1/2 ton status

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    0 compression? That is almost impossible. I had two wrist pins come out of a F##d in a boom truck and with 1/8 inch deep grooves in those two cylinder wall I still had 35 and 40 psi of compression with those big grooves. So Stuck valves might make sense, but even if the rings were missing you would get some kind of compression.

    I thought I was wrong once,
    but I was mistaken
     
  12. dyeager535

    dyeager535 1 ton status Premium Member

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    Let us know what it turns out to be!

    If I'm thinking correctly, the cam being flat really shouldn't be the problem. Flat cam=no valve lift=high compression, right? Although with two opposing cylinders having problems, the only thing tying them together is the crank and cam, so that would be king of odd.

    Stuck/bent valves could do it, a motor I have ingested a pipe plug (don't ask) and it rattled around until it caught the intake valve just right, and bent it. 0 compression afterwards. Hole in piston or really bad rings should result in billowing smoke from the tailpipe. At least a 2 or 4 valve job should be pretty cheap...or end up being a slightly more expensive and more powerful motor : )

    Easy enough to pull the valve covers and see if anything is wrong up top too.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     

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