368 cad upgrades
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500, 472, 425, 368 Discussion, 368 cad upgrades in Cadillac Engine Technical Discussion; Hello everyone I have a 1981 commercial chassis (hearse) 368 45,000 miles w/ turbo 400 trans only upgrades is quadrajet ...
  1. #1
    MrC. is offline Cadillac Owners Member
    Automobile(s): 1981 commercial chassie 368
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    368 cad upgrades

    Hello everyone
    I have a 1981 commercial chassis (hearse) 368 45,000 miles w/ turbo 400 trans
    only upgrades is quadrajet carb, new fuel pump and emissions deleted.
    I have installed this engine in a 1953 Chevy 210 (2600lbs) and 3.73 gears and have logged several hundred miles on it.
    Now I'm looking for upgrades

    Cam, lifters, Intake, flat or dome pistons, headers
    My goal is 450hp and 450ft torque street motor with a noticeable idle.

    what do you advise to reach this goal?
    What works ( part swaps between platforms ) ect. ect.

    Thank you in advance for your suggestions

    Godspeed
    MrC.
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  3. #2
    jayoldschool's Avatar
    jayoldschool is offline GM RWD V8 addict
    Automobile(s): 81 FWB D'Elegance coupe
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    Ontario, Canada
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    Re: 368 cad upgrades

    I would suggest contacting MTS: http://www.500cid.com/

    Check out their site, it will be very helpful.

  4. #3
    deVille33 is offline Cadillac Owners Connoisseur
    Automobile(s): 1977 Coupe (blue), 1977 Coupe (yellow), 1977 Coupe (green)
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    Re: 368 cad upgrades

    Nice installation. Are you using the stock suspension? Those cars had a bit of roll in the corners, but were fun cars all the same.

  5. #4
    MrC. is offline Cadillac Owners Member
    Automobile(s): 1981 commercial chassie 368
    Join Date
    Mar 2014
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    40
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    Re: 368 cad upgrades

    No its a frame up build, I put a mustang II under it and a 10 bolt rear with s-10 leaf springs.
    It has 4 corner air suspension so there is very little roll.
    Future plans are to 3 link the rear.

    The engine/trans was free to me so I used it. I did call Cad company, the only options for this engine is a cam/lifters and springs. total hp gain would be about 65hp.
    I have a ad out now and I am searching for a 500/472 since it will bolt right in, I like the "how'ed you get that in there" and "what the heck is it" aspect when I pop the hood.
    So I will just drive it as is until I can find a 500.

    Thanks for you
    Input.
    MrC.
    Attached Images

  6. #5
    deVille33 is offline Cadillac Owners Connoisseur
    Automobile(s): 1977 Coupe (blue), 1977 Coupe (yellow), 1977 Coupe (green)
    Join Date
    Mar 2006
    Location
    Western Massachusetts
    Posts
    1,364

    Re: 368 cad upgrades

    Oh, nice. Coupes were less prevalent. It was post war and baby boom era and they sold more 4 - doors than coupes.

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