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Thread: odd fire motor even fire distributor

  1. #1
    Join Date
    Feb 2003
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    West Newbury, MA
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    Default odd fire motor even fire distributor

    A while back I had this mystery: on an engine that I was replacing the HEI in someone pointed out that the existing HEI was an even firer not an odd fire. I had assumed it was an odd fire because it was the stock engine in a 71 cj. The engine ran great with the this distributor. When I brought the distribitor to NAPA they confirmed that it was from an even fire 75 buick motor. I replaced the old HEI with the same model as I had removed
    I believe the usual indicators that confirm whether or not you have an odd fire motor is the unique pattern of the plug towers on the distributor; that the timing marker on the odd is cast into the timing case cover as opposed to being bolted on and that the cranks shafts for the two engines are different. There is a picture of the two cranks side by side in the V6 Engine power book whose title I can't remenber at the moment.
    While doing the time chain replacemennt I took some pictures of the crank. It appears to me that the crank is an odd fire crank. So there is still a mystery as to how an odd fire motor can run well with an evenfire distributor.
    Any opinions?
    1968 CJ-5 V6 registered
    1971 CJ-5 V6 half cab
    1957 FC-150 registered
    1958 FC-150 parts

  2. #2
    Join Date
    Sep 2002
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    Los Baños, Laguna
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    Default Re: odd fire motor even fire distributor

    First '75 would've still been odd-fire.

    Second, I had the same question about mine, never did resolve it, just put in an Odd-Fire distributor. You could see the arcing on the coil of the even fire.


    Adam Sparks

    “Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime.” ~ Mark Twain

  3. #3
    Join Date
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    West Newbury, MA
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    Default Re: odd fire motor even fire distributor

    Your Right Spark I meant to say a 1977 even fire.
    1968 CJ-5 V6 registered
    1971 CJ-5 V6 half cab
    1957 FC-150 registered
    1958 FC-150 parts

  4. #4
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    Sep 2002
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    Los Baños, Laguna
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    8,681

    Default Re: odd fire motor even fire distributor

    That makes sense.

    Probably the only thing here that does. I really have no clue. Mine ran strong, and good, it's smoother with an OF distributor though.


    Adam Sparks

    “Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime.” ~ Mark Twain

  5. #5
    Join Date
    Mar 2003
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    Falcon, CO
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    Default Re: odd fire motor even fire distributor

    Can't seem to pull up the pic attachments - since I am the one who pointed out the OF EF issue. Wanted to compare with Pat G.s book to see.
    Chuck AKA Warloch
    51 CJ3A - V6 Kenne Bell 225, EFI - 4.88 Axles with OX lockers - SM465*49 CJ3A - V6 225, EFI, T18, OD, 5.38s - fight is on who gets it (Grandson in the lead)*72 Commando - Sporting a 360, T18, body and Misc left to do*61 CJ6 - V6 225 - Project Shrek for Sheldon - waiting for the Commando to finish*62 CJ5 - 225, D18, OD, 5.38s - Niece's Rig

  6. #6
    Join Date
    Sep 2002
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    Los Baños, Laguna
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    Default Re: odd fire motor even fire distributor

    Quote Originally Posted by Warloch View Post
    Can't seem to pull up the pic attachments - since I am the one who pointed out the OF EF issue. Wanted to compare with Pat G.s book to see.
    It's an OF crank.


    Adam Sparks

    “Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime.” ~ Mark Twain

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