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500, 472, 425, 368 Discussion, New 500 owner in Cadillac Engine Technical Discussion; Hello everybody, I just purchased an newly rebuilt 8.2L Caddy 500. It is a 1976 model converted into a marine ...
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    Doughemi's Avatar
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    New 500 owner

    Hello everybody,
    I just purchased an newly rebuilt 8.2L Caddy 500.
    It is a 1976 model converted into a marine engine for my 27 foot boat.


    So far, I have cleaned everything up and painted it. I replaced the dist. cap, coil, spark plugs and wires and mounted it.
    I also have installed a Crane HI 6S ignition kit, and a Edelbrock Preformer intake manifold.
    I have to buy a new carb, wedge plate, and alternator.

    My question is..... what is the best 4bbl carb, Edelbrock or Holly? Will I need 750 CFM or 600 CFM.
    Also, do I need to get a 100 amp alternator, or will a 60 amp be good enough. I can't find any books on this engine, does anybody know where I can get one?

    Last question, I am also looking to replace my mechanical fuel pump, I can't find one for the Caddy 500.
    Thanks, Doug

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    Re: New 500 owner

    I wouldn't use less than a 750 for the carb, that's a lot of engine to feed! The Fleetwoods of that era had 100 AMP alternators, so just try going to a parts store and getting one for a '76 Fleetwood EFI. I'm not sure of how much power you do need, since you didn't say what it's all running.
    As for the fuel pump, any from the 472 or 500 will work. Those should be easily available at parts stores as well.

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    Re: New 500 owner

    Thank you for the quick response, caddyddaddy.
    I went ahead and ordered the E-brock 1410 (750 CFM) Marine carb.
    I can't wait to get this baby fired up!!!!!

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    Re: New 500 owner

    Well, after months of work I am finally ready to start the engine.
    What I did was put a 500 caddy engine in my boat.
    Here is a look at what I've done so far:


    I've added an Edelbrock performer manifold, Edelbrock 1410 750 carb, new fuel pump, starter,alternator, plug wires and plugs, distributer and coil and hooked up the Crane HI-6M electronic ignition. I got everything hooked up and tried to start it yesterday and it would not start!!!!

    So back to the basics, I am not positive what the firing order is and I not sure which cylinder is number 1.

    Can somebody help me please!!

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    Re: New 500 owner

    Ah, the crazy Cadillac firing order.

    1 5 6 3 4 2 7 8

    BTW:
    The engine is looking good!

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    Re: New 500 owner

    Thanks, at least I got that part right.

    Looking at the engine from the back of the boat, with the tranny at my feet, is the number one cylinder on the LEFT side of the block?
    Also, does the rotor in the distributer cap spin clockwise or CCW?

    I should know this stuff but I was never able to find a book specifically for my engine.

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    Re: New 500 owner

    I'll have to look at one of my intakes today. I can't remember correctly. Something tells me it would be on the left side though.

    The rotor does spin clockwise though.

    I'll look at my manifold in a couple hours after I go out there.

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    Re: New 500 owner

    Cool, thanks.

    That Crane HI-6 is cool. Have you ever used one?


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    Re: New 500 owner

    The firing order should be on there, but remember that the #1 is passengers front, not drivers front.

    Oh, and the best 4bbl carb is a Q-jet. I dunno if they have problems with marine use, but the Cad Company made the best power with the Q-jet on their dyno mules untill they got to a serious race-level 500 where a big Holley made a few hp more.

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    Re: New 500 owner

    Yes, it is on the stocker, but he is running an Edelbrock. I also agree about the Quadrajet. Someone makes Quadrajets specifically for marine use as well.

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    Re: New 500 owner

    I'll buy a Quadrajet and stick it in the cabin, if this one doesn't work well, I'll swap them out. Out there, at sea, it's good to have a backup carb when you only have one engine.



    Also, the engines cranks slowly, should I be worried?

    I just put a Marine starter on it.

    I can't wait to get this thing on the water, she is going to haul ass!
    I carry 164 gallons now. I just put the two 27 gallon tanks on last month.

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    Re: New 500 owner

    That's one cool project!

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    Re: New 500 owner

    Quote Originally Posted by The Ape Man
    That's one cool project!
    I second that!

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    Re: New 500 owner

    Well, I worked on it a bit more this afternoon, I got all the plug wires on correctly and all of the initial settings on the ignition module set.
    Still no joy, won't start. I checked the plugs for a spark and did not have one, I guess I trashed the coil somehow, it had a great spark when I first started out, now there is nothing. I'll change the coil and try again.

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    Re: New 500 owner

    Quote Originally Posted by Doughemi
    Still no joy, won't start. I checked the plugs for a spark and did not have one, I guess I trashed the coil somehow, it had a great spark when I first started out, now there is nothing. I'll change the coil and try again.
    I don't know much about aftermarket ignitions like the Crane HI 6S you mention. What triggers it, points, hall effect, HEI trigger? If the trigger is there, is the coil signal present?

    Do you still have the original ignition? Might try starting with that, then check all the part for the new ignition. One change at a time tends to work well.

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