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327 .60 over

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by shaun, Sep 23, 2003.

  1. shaun

    shaun 1/2 ton status

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    I have a 327 in my 71 blazer. I want to keep it and try it out which is why I amrebuilding it. BUT I just found out it is bored .30 over already. And have been told it will have to be bored again. What effect will it being bored .60 over have compared to it stock. Is this smart or will it make my engine to weak. Any help and over all suggestions. Thanks /forums/images/graemlins/1zhelp.gif
     
  2. Robin

    Robin 1/2 ton status

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    What it means is that it's the last time you can bore it out (you can't go more then .060 over).

    My machinist encouraged me to go straight to .060 over to get the benefit of the extra cubies. If my calculations are right a 327 .060 over will net you 337
     
  3. Triaged

    Triaged 1/2 ton status

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    It might cleen up at .040" over. Most pistons now come in that size as well now.
     
  4. shaun

    shaun 1/2 ton status

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    I am going to go with the .40 over if it will clean up there. I found two sets of pistons for it. Thanks /forums/images/graemlins/thumb.gif
     
  5. tarussell

    tarussell 1/2 ton status

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    Although .060 over bore is about the limit for a motor that is driven on the street/trail you have got the benefit of an older ( better ) casting block that is a bit thicker and has better nickle contenet than some mid seventy's on up stuff. I would not worry if it does not clean up at .040 and you have to go .060 .
    Good luck , Tom
     
  6. blaz72

    blaz72 Registered Member

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    .60 over on problem.max on old 327s is 120 over but needs custom pistons and makes walls little thin but will run.
    Did it to my 69 camaro no problems.If you like engine .60
    is fine.
     
  7. jasonkh2tg

    jasonkh2tg 1/2 ton status

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    there are ton of options you have before you..your 327 is the same block as a 350 except for the crank...but all 327 blocks are 2 bolt and all 327 cranks are forged...you could take a 350 crank and up the cubes or take a 350 block and use a 327 forged crank and have a 4 bolt main 327 KEWL.....

    but back to the queston .60 over as said before is fine and you should have no problems.....

    I have both a 350 4 bolt in the garage and a 327 I myself might make a 327 four bolt...Oh also there are large and small jouranl 327 the journal size was larger on later 327's not sure on the year... /forums/images/graemlins/k5.gif
     
  8. chevyracing

    chevyracing 1/2 ton status

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    67 was the last year of the small journal.

    John
     

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