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Which Hei Distributor To Choose

Discussion in 'Early CJ-5 and CJ-6 Tech' started by Brislin06, Jun 2, 2018.

  1. Jun 2, 2018
    Brislin06

    Brislin06 New Member

    Pennsylvania
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    hey guys just curious what the best hei distributor to convert to on a 225 v6. I have points right now and I’m looking to upgrade. I found the dui hei and an hei from CRT performance. The one from crt is a bit cheaper I’m wondering if anyone has had a experience with it.
     
  2. Jun 2, 2018
    Daryl

    Daryl Sponsor Sponsor

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  3. Jun 3, 2018
    Warloch

    Warloch Did you say Flattie??? Staff Member Sponsor

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    The first one I bought was from CRT - since then, I've built my own. No issues with the CRT unit.
     
  4. Jun 3, 2018
    masscj2a

    masscj2a Member Sponsor 2019 Sponsor

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    I'm looking to do the same thing also. Been thinking about it for a while now, but just not sure which one to pull the trigger on. I have heard a lot of talk about it and heard a whole variety of different choices. I'll be watching this one. I would like to hear from those who installed. Thanks for posting.

    Any change of coils to go with this ?? Upgrades etc ?
     
  5. Jun 3, 2018
    y2grey

    y2grey Member

    Fayetteville NY
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    I run a CRT unit. I've installed two. Great directions, easy installation, awesome performance.
     
  6. Jun 3, 2018
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member Sponsor 2019 Sponsor

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    You don't use a separate coil when you go HEI...It's in the cap.
     
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  7. Jun 3, 2018
    Brislin06

    Brislin06 New Member

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    I also read that when you install one of these you have to grind down part of the intake manifold for clearance. Can that be done with the intake still on the motor?
     
  8. Jun 3, 2018
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member Sponsor 2019 Sponsor

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    Yep.
     
  9. Jun 3, 2018
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member Sponsor 2019 Sponsor

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  10. Jun 3, 2018
    Daryl

    Daryl Sponsor Sponsor

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    This is THE single best change that you can make to a v6. It is also the ONLY GM HEI distributor that has to be clocked in the exact right place when installed. Many a seasoned mechanic has been stymied because they simply were not aware of how to install it. The number one plug needs to also be on the correct spot on the cap.
     
  11. Jun 3, 2018
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member Sponsor 2019 Sponsor

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  12. Jun 3, 2018
    timgr

    timgr Jeepin' Nerd Sponsor 2019 Sponsor

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    Just a comment about this - you have to match the firing pattern of an odd-fire distributor, not necessarily the firing order. The odd-fire gives a spark at first 90 then 150 degrees of crank rotation, and the distributor rotation between sparks is 45-75-45-75-45-75. So you have three positions of the wires that will be matched with the firing pattern - move the wire positions, and you may no longer be firing at the same advance before TDC on all of the cylinders.

    V6 engine - Wikipedia

    Never owned a 225, but I expect the other two possible locations for the wires simply won't work on the 225 because of interference with the cap shape or the vacuum advance canister.
     
    Last edited: Jun 3, 2018
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  13. Jun 3, 2018
    timgr

    timgr Jeepin' Nerd Sponsor 2019 Sponsor

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    NB just getting the plug wires in the right place on the cap is not sufficient - you also need for the rotor to point to the #1 wire when the cylinder is at TDC on the compression stroke.
     
  14. Jun 3, 2018
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member Sponsor 2019 Sponsor

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    Doesn't that come with the territory?
     
  15. Jun 3, 2018
    timgr

    timgr Jeepin' Nerd Sponsor 2019 Sponsor

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    Yes ... sorry for stating the obvious :coffee:

    Just trying to be thorough. I've already changed the wording of the original post a couple of times to make it more clear. :oops:
     
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  16. Jun 3, 2018
    Daryl

    Daryl Sponsor Sponsor

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    The timing of which pick-up coil lobe that it is on also matters. Like I said, not your normal GM hei that is stick it and put number one on whichever point on the cap the rotor is facing.
     
  17. Jun 3, 2018
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member Sponsor 2019 Sponsor

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    :( Sorry...It's probably NOT obvious...Reminders are good. IIRC...You can clock it wrong and it will still run, but VERY poorly.
     
  18. Jun 3, 2018
    Daryl

    Daryl Sponsor Sponsor

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    After installing an HEI in at least 25 different odd-fire Jeeps, I still have to re-check the specifics on what to do. Nothing obvious about it. We should try to put a definitive sticky together on what it actually takes. Many a tool has been thrown trying to figure this out. It is still the very best upgrade for a 225.
     
  19. Jun 3, 2018
    47v6

    47v6 junk wrecker! Sponsor

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    doesn't the DUI model have an extended body to clear the intake?
     
  20. Jun 3, 2018
    Rozcoking23

    Rozcoking23 RUN & GET BIT! Sponsor

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    They have 2 versions. A short version and a long version. Make sure you order he long version, you wil still need to use a button head bolt on the intake manifold to clear.
     

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