81 Coupe DeVille Engine swap - Page 4
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 81 Coupe DeVille Engine swap in Past Cadillac Vehicle Discussion; Just cap one of the opening on the passanger side and run dual exhaust. They do make manifolds without the ...
  1. #46
    csbuckn is offline Cadillac Owners Master
    Automobile(s): 84 Coupe w/500
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    Re: 81 Coupe DeVille Engine swap

    Just cap one of the opening on the passanger side and run dual exhaust. They do make manifolds without the crossover but they are rare. Not sure what headers would fit. Did you check the link in post 41? It has a pic of the cap that was made for mine. Its just a frost plug welded into the end of a pipe.

  2. #47
    asaddman is offline Cadillac Owners Member
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    Re: 81 Coupe DeVille Engine swap

    I did see that summit racing offers the cap for around 20 bucks, I will have to see which way I want to go with it, make it or buy it. Which port would I need to cap? I was thinking the farthest back due to the crossover drops out around the same angle, I will have to see once it is in I guess if it don't matter.

  3. #48
    csbuckn is offline Cadillac Owners Master
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    Re: 81 Coupe DeVille Engine swap

    Your exhaust shop would love for you to cap the one thats pointed a little towards the front. It would be hard to do exhaust for that one.

  4. #49
    asaddman is offline Cadillac Owners Member
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    Re: 81 Coupe DeVille Engine swap

    Hello everyone
    Sorry it has taken me so long to get back on here, been busy and broke, not a good combo when working on cars.

    Update on the engine swap
    Got the 307 in and bolted up, everything is looking good just have a couple questions maybe someone can answer for me.

    First the lines that run under the oil pan on the frame go back to fuel tank, one line goes to the vac canister and the other used to go to the throttle body, in my manual it says that it is a fuel vapor line, do you know what I should do with it? Cap it? run it somewhere else?

    Second, I have a carb on the engine and the dist. is a non vaccumm advanced do I need to just cap the carbs vac line for the adavance?

    Third, the water pump on the olds engine has a outlet/inlet tube off the front angled towards the passanger side, the caddy did not have this, I have a nipple on the back of the intake manifold going into the valve for the heater core (i assume) and the other one (from the way the caddy was originally) goes into the radiator, leaving no extra hoses for the water pump outlet.

    Other than that I only have a few things that I am not sure if its going to work correctly like the switches and sensors for heat/air and the dumby gauges.

    Also I have the complete 6.0 engine that came out, all brackets and stuff is there. Got an alternator and starter both still good, dist, p/s pump and lines, need to get them out of the garage if anyone is interested I will make a sweet deal for you if you take everything.

  5. #50
    csbuckn is offline Cadillac Owners Master
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    Re: 81 Coupe DeVille Engine swap

    Nice work, no pics of progress?
    I left the vapor canister line unplugged, it vents the gas tank. Some people will cut the line close to the gas tank and put a small air filter on it. Cap off all lines not used on the carb. Cap the line on the water pump with something that will hold up against the temp of coolant and use the one on the radiator. Whatever old sensors you can get back into the Olds motor will work when plugged back in like temp and oil pressure. Just pay attention to any ground wires you took off under the hood, you may have to ground them again to get some stuff to work. Was your caddy motor fuel injected?

    Would you part with any of the parts off your caddy motor? I could use the motor mounts, oil pan and oil pickup tube.

  6. #51
    asaddman is offline Cadillac Owners Member
    Automobile(s): 81 Coupe DeVille
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    Re: 81 Coupe DeVille Engine swap

    yes the caddy was fuel injected, I have the motor mounts, oil tube, the pan is shot, has a hole in it. I will post some pics next day or so. Thanks csbuckn on the info.

  7. #52
    asaddman is offline Cadillac Owners Member
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    Re: 81 Coupe DeVille Engine swap

    06140120111.jpg

    Here is the engine inside the car. The pic is not great due to me using my cell phone but you all get the idea, once it is running I will pull it out of the garage and be able to get better pics then

  8. #53
    sven914's Avatar
    sven914 is offline Cadillac Owners Connoisseur
    Automobile(s): 1989 Brougham d'Elegance, 1985 Fleetwood Brougham *Coupe*
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    Re: 81 Coupe DeVille Engine swap

    Was it Chevrolet orange when you got it?

  9. #54
    asaddman is offline Cadillac Owners Member
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    Re: 81 Coupe DeVille Engine swap

    no it was light blue, I just like the orange plus I am originaly from colorado and orange and blue go great together in my opinion (go Broncos!)

  10. #55
    Fleetwood472 is offline Cadillac Owners Fanatic
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    Re: 81 Coupe DeVille Engine swap

    Hey Asaddman,

    Do you still have that 368? I tried to PM you but am unable to. Let me know. Thanks - Justin

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