Aluminum Block porisity

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Northstar Engines and System Technical Discussion Discussion, Aluminum Block porisity in Cadillac Engine Discussion; While getting parts for my ignition system I section cut a block .upper right is the bottom of a head ...
  1. #1
    zbuickman is offline Cadillac Owners Member
    Automobile(s): northstar ignited Big Block
    Join Date
    Aug 2007

    PostAluminum Block porisity

    While getting parts for my ignition system I section cut a block .upper right is the bottom of a head bolt hole and lower left is the main journal. you can see how many holes are in the aluminum . pretty low quality casting. The block halves are still bolted together so you can also see the sealant and oil gallerys.
    In the other picture we see the cast in sleeve and the water jacket. notice the porisity here as well. I can definatly see why a timesert should be used on a H.G. R&R

    just my .02

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  3. #2
    99Classillac's Avatar
    99Classillac is offline Cadillac Owners Enthusiast
    Automobile(s): Ex-99 Deville owner, Now-04 DTS and 05 DTS. ZX6R Pilot too.
    Join Date
    Nov 2005
    Upper Marlboro, MD

    Re: Aluminum Block porisity

    That is pretty sorry casting

  4. #3
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2006 STS V8 AWD, '95 Ford Ranger
    Join Date
    Jul 2004
    Fairbanks, Ak

    Re: Aluminum Block porisity

    I repaired the transmission case on a Porsche that was way worse than that. What you see there is pretty standard for pressure die castings. If you want to eleiminate porosity you have to go to sand castings.
    Don't mess with Binky Bear!

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