Slow Blowthru engine build.

Discussion in 'Before Black (non-SFI) Tech' started by WarWagon, Apr 13, 2013.

  1. MNcarbturbo

    MNcarbturbo
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    Well that's sure ugly.

    Will the block bore out or is it cooked?
     
  2. GNVAIR

    GNVAIR
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    I had that happen 25 years ago in my 78 Malibu doing 80 on the Atlantic City Expressway coming back from the Jersey Shore. It was a God awful grinding noise and then the wheels locked. Antifreeze went EVERYWHERE (dripping from the exhaust, overflowing out of the dipstick. Mine dropped and broke the piston which put the connecting rod through the cylinder wall causing the rod to jamb. It was an ugly mess.
    The valve broke but that was sub damage. The real failure was the stock style stamped valve locks/keepers that were worn out and let go of the valve. I still have the connecting rod as a souvenir as it was probably one of the worst engine failures I have personally ever experienced!
     
  3. WarWagon

    WarWagon
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    Very Ugly, I'm not sure yet on the blocks fate yet. It was a very tired old .030 over bore block that really needed to go to .040 over back when I put it togther. Before I tore the engine down, after a day of sitting with the spark plugs out that hurt cylinder filled up with coolant. I'm really only wanting to salvage the head and it looks like it just needs a new intake valve seat, the valve guide still looks good and is not sloppy. I'll have it crack tested when I take the head to the machine shop.
     
  4. WarWagon

    WarWagon
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    This was my first valve dropping experience on any engine and it sounded bad with no warnings or clues that it was about to happen, dang it why did it have to be my Buick.
     
  5. GNVAIR

    GNVAIR
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    At least you have other cars to drive. I was 19 at the time and it was my only car. I walked and bummed ride until I got enough money together to buy another engine. But yeah it really sucks!
     
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  6. WarWagon

    WarWagon
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    I finished tearing the head down and found all three intake valve guides are worn out then took it to my local head machine shop who did work on these heads before. They don't want to put a new intake seat in, said it's too close to the water jacket.
     
  7. GNVAIR

    GNVAIR
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    I would ask in the engine forum to be sure that they are that close to the water. Ask Nick Micale.
     
  8. WarWagon

    WarWagon
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    Update: had the head magnafluxed and it is not cracked but I'm not going to be able to do any work to the head this year as it will consume all the time and $$ I need to play now. I definitely want to save the head though, seems worth it after all they are stage JR's and they have nice port work done. IMOP these are as good or just a touch under Champion CNC irons.
    Plans are to pick one of the blocks I have and reuse most of the top end/valve train on it.
     
  9. ek02

    ek02
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    I forgot you had those heads. They are rare. The only other place I ever saw those heads was in the old Kenne Bell catalog. I hope you can get them repaired eventually.
     
  10. WarWagon

    WarWagon
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    ^---I'll get then fixed, I could feel the gains of the heads alone.

    Got the engine apart and bad piston out and this crack in #2 cylinder ends this blocks fate for now because
     
  11. WarWagon

    WarWagon
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    ^-- I'll get them fixed. I felt the gains of the heads alone.
    I got the engine apart more and this crack in cylinder two seals this blocks fate for now because I doubt I ever get it sleeved anytime soon.
    https://photos.app.goo.gl/cWPaY7i4lsnWt1bA2

    Now I must decide on building one good stock piston engine out of the two I have here or getting the other .030 over 109 block out and building it. Only issue with my spare +.030 109 is the deck is cut with o rings for a loc wire gasket that I know I'll never use.
     

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