1976 500 rebuild pics part 2
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500, 472, 425, 368 Discussion, 1976 500 rebuild pics part 2 in Cadillac Engine Technical Discussion; Sorry the pics did not upload on my first try. Dang technology!...
  1. #1
    davidp1561 is offline Cadillac Owners Member
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    1976 500 rebuild pics part 2

    Sorry the pics did not upload on my first try. Dang technology!
    70eldo likes this.

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  3. #2
    70eldo's Avatar
    70eldo is offline Cadillac Owners Connoisseur
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    Re: 1976 500 rebuild pics part 2

    Looking forward to see more pics!

  4. #3
    drmenard is offline Cadillac Owners Enthusiast
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    Re: 1976 500 rebuild pics part 2

    Are you keeping it fuel injected? Do you have the computer and wiring harness?

  5. #4
    caddydaddy's Avatar
    caddydaddy is offline Cadillac Owners Connoisseur
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    Re: 1976 500 rebuild pics part 2

    What was the cause of the super bent pushrods?

  6. #5
    davidp1561 is offline Cadillac Owners Member
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    Re: 1976 500 rebuild pics part 2

    yes I am keeping it fuel inject and planning on keeping the computer and wiring harness

    ----------

    There were actually 3 bent rods but those two were the worst. The engine actually would still run but obviously acted like it wanted to jump out of the car. These rods were from the cylinders that had the lowest compression when I did the comp test. Not sure what the cause of it was but suspect it was run at very high RPM or it had jumped time maybe but the engine is at the machine shop now so will know soon.

  7. #6
    caddydaddy's Avatar
    caddydaddy is offline Cadillac Owners Connoisseur
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    Re: 1976 500 rebuild pics part 2

    Have you considered a modern EFI system for it? The one on there is so ancient and not as user friendly as newer systems.

  8. #7
    davidp1561 is offline Cadillac Owners Member
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    Re: 1976 500 rebuild pics part 2

    I have thought about it but wasn't sure how it would work with the old ecu and then not sure about the cost of a new one as well. may have wait to switch to a new EFI when I have more $$ available.

  9. #8
    caddydaddy's Avatar
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    Re: 1976 500 rebuild pics part 2

    They can get kind of pricey, but they include new ECUs, fuel pumps, wiring, throttle body, etc. http://www.summitracing.com/parts/fs...-kit/overview/ If you're planning on keeping your Eldo for a long time, and driving it a lot, it might be the best option in the long run, besides converting it to a carburetor.
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  10. #9
    davidp1561 is offline Cadillac Owners Member
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    Re: 1976 500 rebuild pics part 2

    Yes I agree. I will get one but will be down the road after I get the motor back in and see how things work then

  11. #10
    drmenard is offline Cadillac Owners Enthusiast
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    Re: 1976 500 rebuild pics part 2

    These old F/I systems had two fuel pumps.. One in the gas tank and one on the frame rail.. If this is on the eldo the best thing to do is replace the in tank fuel pump with a high pressure pump and take off the pump on the frame rail and plum it straight though .. A Walbro 255 pump is what I have used. Bruce Roe's wiring mod to run the pump can safe problems later on with the ECM.. What he suggests is have the ECM run a relay to power the pump instead of having the ECM power the pump.. By doing that the ECM won't burn up that circuit ... This is just one of the things to do to keep these systems going...
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  12. #11
    davidp1561 is offline Cadillac Owners Member
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    Re: 1976 500 rebuild pics part 2

    Thank you for that info. I will be sure to do that before driving it this spring.

  13. #12
    The Ape Man's Avatar
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    Re: 1976 500 rebuild pics part 2

    Don't even consider a carbonator. Night and day difference on a Cadillac engine.

    Keep a spare ECU and temp sensors, maybe use a different cold air bypass. The originals are pretty hard to get.

  14. #13
    caddydaddy's Avatar
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    Re: 1976 500 rebuild pics part 2

    Quote Originally Posted by The Ape Man View Post
    Don't even consider a carbonator. Night and day difference on a Cadillac engine.
    I will say that my old EFI 500 was the smoothest idling engine I've ever owned! But, like you said, parts are getting hard to find. Lots of them were converted to carburetor for that reason.

  15. #14
    davidp1561 is offline Cadillac Owners Member
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    Re: 1976 500 rebuild pics part 2

    what would be the recommended aftermarket efi system for this engine?

  16. #15
    drmenard is offline Cadillac Owners Enthusiast
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    Re: 1976 500 rebuild pics part 2

    The question is, what are your skills? If you have not spent days upon days working on your car fixing stuff it might cost more than its worth.. If I had a stock 76 eldo and just wanted to keep it stock , I would keep spare parts do a few mods like I said and keep it going.. Ok if you were going to rewire the engine control system in the car , could you do it yourself ? If your paying someone else to do your work , you don't know what you are going to get... Anyone that will do a top notch job , that's not your buddy working for nothing, will cost a ton of money... If you had a spare ECM , if one had a problem , you can have it fixed and still have one to keep you going.. The sensors are now for sale new..

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