500 cadillac motor ?s

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500, 472, 425, 368 Discussion, 500 cadillac motor ?s in Cadillac Engine Discussion; i always wanted a 500 cadillac block to build,my question is are they any 500 motors thats better than others? ...
  1. #1
    85 FLEETWOOD COUPE's Avatar
    85 FLEETWOOD COUPE is offline Cadillac Owners Fanatic
    Join Date
    May 2011

    500 cadillac motor ?s

    i always wanted a 500 cadillac block to build,my question is are they any 500 motors thats better than others? i know they came in a few makes in the cadillac line but is there 1 better than the other? or pretty much all the same??

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  3. #2
    csbuckn is offline Cadillac Owners Master
    Automobile(s): 84 Coupe w/500
    Join Date
    Jan 2008
    1970 was the best because of high compression, then I think it goes 71-73 is next and then 74-76 are the least favorite but I'm not 100 percent on that though.

  4. #3
    cadillac_al is offline Cadillac Owners Connoisseur
    Automobile(s): 70 Deville 77 Fleet 78 Seville 92 Deville 03 Deville
    Join Date
    Feb 2007

    Re: 500 cadillac motor ?s

    If you are rebuilding it then it won't make much difference what year you buy.

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  6. #4
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
    Automobile(s): '80 Fleetwood Coupe, 1994 and 1995 Mercedes 140 Coupe
    Join Date
    Feb 2005
    Southern NJ

    Re: 500 cadillac motor ?s

    The '70 is nice. Good luck finding one though. '71 was first year for low compression using dished pistons. Owned a perfect copy of one in 1982. It didn't compare for power to the '72 which most likely had a different camshaft and/or cam timing.
    '73 and '74 I have not had but they still used dished pistons. '75 and '76 went to open chamber heads and almost flat top pistons which has always been an easier beast to tune for maximum economy for me.
    The style heads you land up with will dictate a lot of things.

  7. #5
    Roadmaster75's Avatar
    Roadmaster75 is offline Cadillac Owners Member
    Automobile(s): 1978 Eldorado Biarritz
    Join Date
    Feb 2012

    Re: 500 cadillac motor ?s

    IF you are building one to put into something other than the car it came with,
    then suggest finding a 500 from an Eldorado. They have the desirable
    rear sump oil pan. This allows them to fit in a variety of
    vehicles with minimal modification.
    The engine will respond more readily to MINOR upgrades than other makes of motors ... most notably
    intake manifold/carb, and headers. Combined with a mild (MTS) cam/lifter set up, you
    will have a real stump puller that also cruises around town nicely. I have rebuilt these engines
    and they are lots of fun, but tolerances on Cadillac engines of this era are closer than Chevys, etc.
    SO, buy good rebuild parts and follow the shop manual! Pay particular attention to the re-use of pistons & make sure
    they go back into their original holes! You will note in the manual that the factory used at least 4 variations
    of piston diameter when building them. They will be coded and matched on the block and piston.
    Have fun!
    The Ape Man and The Ape Man like this.

  8. #6
    70eldo's Avatar
    70eldo is offline Cadillac Owners Connoisseur
    Automobile(s): 1970 Eldorado.
    Join Date
    Sep 2005
    Dutchman in Germany

    Re: 500 cadillac motor ?s

    cad500parts have plenty of parts (and advice) for rebuilding 500cid

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