Register now to get rid of these ads!

HEMI Tech: Machining

Discussion in 'The Hokey Ass Message Board' started by scootermcrad, Nov 16, 2006.

  1. scootermcrad
    Joined: Sep 20, 2005
    Posts: 13,071

    scootermcrad
    ALLIANCE MEMBER

    **This is being started in tech week, but isn't really related to tech week**

    So I've been talking to a few people about machining work for my hemi build. What to get, what's actually needed, what to look out for, etc. etc.... So, that's when I realized we don't have a topic related to just machining for Hemis! A very important topic in my eyes. So let's see what kind of things we can talk about and add another chapter to the Hemi Tech archive.

    1) Block Machining
    - What is a sure sign that the block needs attention (obvious, but should still be listed)
    - What can someone look for while the block is sitting on the stand/floor of the garage?
    - What are the standard machining practices to prep a block for rebuild?
    - When should a block NOT be overbored?
    - When should a block be magnafluxed?
    - Is sonic testing really necessary and when?
    - should a block ever be decked for the heads?
    - when should a line-bore be performed, if ever?
    - What should be done to main caps and when?
    - Do oil galleys need attention?
    - Can a cracked block be repaired?

    2) Heads
    - what should be inspected right off the bat?
    - When should a head be decked/surfaced?
    - When is porting recommended?
    - Can valve guides be replaced at home?
    - What are the standard procedures that should be performed/requested by a machine shop doing quality work?

    3) Crank
    - What should be inspected before taking the crank in for sevice?
    - What standard services should be performed?
    - When should the journals be attended to?
    - What should/can be done to oil galleys?
    - When should the journals be under-filleted where they meet the counter balances?

    4) Camshaft
    - What should be inspected before taking the cam in for sevice?
    - What standard services should be performed?
    - When should the journals be attended to?
    - When should it be reground?
    - What else should be attended to and why?

    5) Rods
    - What should be inspected before taking the rods in for sevice?
    - What standard services should be performed?
    - When should the bearing seats be attended to?
    - What should be done to big and little ends of the rods?
    - When should the rods be shot-peened, if ever?

    6) Other misc. machining required?

    7) What would someone expect to pay for all these services?

    Hopefully these questions will spark some discussion or other questions so we can get yet another topic filled out for our reference. I realize some are real obvious questions, but that shouldn't stop us from stating the obvious and getting it out there to someone who may NOT think it's so obvious.
     
  2. George
    Joined: Jan 1, 2005
    Posts: 6,752

    George
    Member

    Deck to crank checked to verify square(parellel) or not. If cylender has little/no wear/out of round over bore might not be needed, or big over bore could prevent additional boreing. Obvious look for cracks in block, often near freeze plugs.
     
  3. scootermcrad
    Joined: Sep 20, 2005
    Posts: 13,071

    scootermcrad
    ALLIANCE MEMBER

    Here is a link to a thread I have going on machining work for my 331:
    http://www.jalopyjournal.com/forum/showthread.php?t=143018

    Thanks George! Keep the info coming! I know you have tons of info packed away on everything Hemi! :)
     
  4. BigBlockMopar
    Joined: Feb 4, 2006
    Posts: 1,359

    BigBlockMopar
    Member

    Can anyone confirm or not if all (392) Hemi mainbearings are actually fully grooved?
     
    Register now to get rid of these ads!

  5. DE SOTO
    Joined: Jan 20, 2006
    Posts: 3,833

    DE SOTO
    Member

    SONIC TESTING IS A MUST IF YOU HAVE A BLOCK WITH ALOT OF WATER JACKET RUST OR IF YOU ARE DOING A LARGE OVER BORE.

    Like my .090 over 330 DeSoto .......... mine was fine, But it was a MUST for big over bore:D
     
  6. George
    Joined: Jan 1, 2005
    Posts: 6,752

    George
    Member

    Elaboration on my original comment. Deck height should be checked to make sure both banks are the same, and that they are square both front to back & top to bottom.
     
  7. HemiRambler
    Joined: Aug 26, 2005
    Posts: 4,032

    HemiRambler
    Member

    Yes they are.

     
  8. hemi35
    Joined: Dec 9, 2006
    Posts: 282

    hemi35
    Member
    from Australia

    One of the most important things that is often overlooked is a crack test. Its on top of the must do list when I spend money on an unknown block....
     
  9. scootermcrad
    Joined: Sep 20, 2005
    Posts: 13,071

    scootermcrad
    ALLIANCE MEMBER

    On a tangent here... Considering adding a reference thread to the HEMI Tech section for local machinist in "your area" so people know where to go and what we think of them. It would require the attention of all HAMBers that know of shops that do HEMI work though.

    What do you guys think???
     
  10. I think it's a great idea.

    The only shop I could trust with my parts is no longer in business.

    Perhaps they could "sticky" it for a while so all can see the request. Or maybe open the request up to all engine makes, as a truly good engine machine shop can work on anything from a Briggs & Stratton to an EMD.
     
  11. scootermcrad
    Joined: Sep 20, 2005
    Posts: 13,071

    scootermcrad
    ALLIANCE MEMBER

    Last edited: Sep 9, 2008

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2013 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.