472/500 Eldebrock intake vs stock - Page 2
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500, 472, 425, 368 Discussion, 472/500 Eldebrock intake vs stock in Cadillac Engine Technical Discussion; I did not remove the AC this car never had it. I bought the car from a man in Washington ...
  1. #16
    Sasquatch's Avatar
    Sasquatch is offline Cadillac Owners Fanatic
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    Re: 472/500 Eldebrock intake vs stock

    I did not remove the AC this car never had it. I bought the car from a man in Washington State and had it brought across the country on a car hauler to Florida. I guess they didn't need the air. I may go with some after market air in the future. After all this is a hearse not a drag racer. I'm just looking for a few bolt on improvemnts like intake, headers, and maybe duals without getting into the "guts" of the engine.

  2. #17
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    Re: 472/500 Eldebrock intake vs stock

    Got this in an email from Cad Company
    The PCIII intake looks identical to a regular Edelbrock. All of the modifications are on the inside. I really canít tell you if your air cleaner is too tall because I donít know what air cleaner you have. Your 1411 carb will bolt up to the Edelbrock or PCIII intake without an adapter. The headers and dual exhaust will help more than the intake, and wonít hurt the bottom end at all. The PCIII hurts the bottom end less than the as-is Edelbrock. The 1411 hurts from idle to redline. With Headers, dual exhaust, PCIII intake, and the 1411, you will be maybe 10 Ft-Lbs over stock at 2000 PM and 20-30 HP over stock at 3800. A cam swap and a better carb will make about 30-40 Ft-Lbs over stock at 2000 and 30-40 HP over stock at 3800, plus it will pull to over 4500 instead of falling on its face at 4000 or so. You can change the cam without changing the valves or rockers, but youíll want to change the timing chain while you are there (you should probably change it anyway, because the stock gears are plastic and aluminum and are a maintenance item that is usually neglected).

    If you donít want to go inside the engine, and you donít want to replace the carb, the best combination of parts is going to be the PCIII intake and the headers and dual exhaust. There isnít much else you can do beyond intake and exhaust with those restrictions

  3. #18
    terrible one's Avatar
    terrible one is offline Banned
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    Re: 472/500 Eldebrock intake vs stock

    So are you doing headers and dual exhaust?

  4. #19
    Night Wolf's Avatar
    Night Wolf is offline Cadillac Owners 10000+ Posts
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    Re: 472/500 Eldebrock intake vs stock

    AC has been standard on Caddillacs since... 1961 IIRC?

    is it a Caddy hearse? just seems kinda strange...

  5. #20
    Colt D is offline Cadillac Owners Member
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    Re: 472/500 Eldebrock intake vs stock

    Quote Originally Posted by Night Wolf
    AC has been standard on Caddillacs since... 1961 IIRC?

    is it a Caddy hearse? just seems kinda strange...
    According to my 1968 Shop Manual and 1968 Owner's Manual, it was an option in 1968. The fuel filter used in 1968 was different for A/C cars, as only the A/C cars had the vapor return line. Also, the non A/C cars in 1968 did not have the power steering fluid cooler.

  6. #21
    Sasquatch's Avatar
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    Re: 472/500 Eldebrock intake vs stock

    Yes it is a Cadillac. One of only 116 three way loaders made that year by Superior for Cadillac.. AC was an option.

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