Commercial vs non-commercial 500
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500, 472, 425, 368 Discussion, Commercial vs non-commercial 500 in Cadillac Engine Technical Discussion; Is their such a thing? Were the 500s that were putting into the limos in '75 and '76 any different ...
  1. #1
    Underdog is offline Cadillac Owners Member
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    Question Commercial vs non-commercial 500

    Is their such a thing? Were the 500s that were putting into the limos in '75 and '76 any different than the 500s sold in the " regular " Cadillacs? If they were different, how so?

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    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: Commercial vs non-commercial 500

    I own a 500 which originally powered a limo. It's been in the family for 25 years now. I have not noticed anything different about it than all the other Cadillac engines of similar type.

  4. #3
    BluEyes's Avatar
    BluEyes is offline Cadillac Owners Enthusiast
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    Re: Commercial vs non-commercial 500

    The core engine is the same as far as I know, but in my '70 FSM there are a few differences in stuff like the carb calibration, operating pressures in the AC system and so forth. Mostly it seems to be changes to accomodate the rear AC system in the limos.

  5. #4
    yorfate is offline Cadillac Owners Member
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    Re: Commercial vs non-commercial 500

    On commercial chassis engines, the steel flex plates were all the same..for some reason, the balancers were not. My machinist has confirmed this. Only their weight is different due to the added driveline parts on the 75's and commercial chassis. If anything the carb calibration and 4 row radiators be a would natural boost for the regular models.

  6. #5
    DouglasJRizzo is offline Cadillac Owners Enthusiast
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    Re: Commercial vs non-commercial 500

    The 500's in my two hearses don't seem any different than the engines that had been in my previous Cadillacs. What does seem different is the radiators and A/C. Oh, the sway bars are huge, too.

  7. #6
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: Commercial vs non-commercial 500

    Quote Originally Posted by yorfate View Post
    On commercial chassis engines, the steel flex plates were all the same..for some reason, the balancers were not. My machinist has confirmed this. Only their weight is different due to the added driveline parts on the 75's and commercial chassis. If anything the carb calibration and 4 row radiators be a would natural boost for the regular models.
    Ancient thread! I was here then : )

    I have seen some really heavy duty thick water pump pulleys on some 500s. No idea where they came from anymore.

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