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cadillac 500

Discussion in 'The Hokey Ass Message Board' started by agutto13, Apr 8, 2011.

  1. agutto13
    Joined: Feb 20, 2011
    Posts: 156

    agutto13
    Member

    going to buy a Cadillac 500 or 472 not sure the actual cubic inch, but anyways the guy said its out of an early 70's Cadillac. i know in 1970 the 500 and 472's compression ratio was way up and produced a lot more torque and horsepower, but later years suffered tremendously, i wanted to know if there's anyway to spot a difference between the years visually. the motor is 2 hours away and im going up to look at it on saturday. he sent me two pics of the motor and before i go up there and look at the motor i wanted to see if anyone on here knows anything about them.

    Thanks!
     

    Attached Files:

  2. silentpoet
    Joined: Sep 27, 2009
    Posts: 207

    silentpoet
    Member
    from NWA

    Bump, wish I had more knowledge. There might be some info on the modified Cadillac board or on the MTS page. I don't know what casting numbers you need to look for, but I think mts would have that info. Sorry I can't post links as they are on my computer at home.
     
  3. JOECOOL
    Joined: Jan 13, 2004
    Posts: 2,759

    JOECOOL
    Member

    i've been told that only the Eldo had the 500. If that is true then it should have a FWD style pan. As far as the year goes there should be casting dates on the block and heads.I am not an expert on Caddies but was also told the best way was to take out the spark plug and turn them over and measure the stroke. Hope this helps.
     
  4. silentpoet
    Joined: Sep 27, 2009
    Posts: 207

    silentpoet
    Member
    from NWA

    The other caddies got the 500 in 75 and 76.
     

  5. jjayf
    Joined: Aug 16, 2010
    Posts: 214

    jjayf
    Member
    from Yelm, Wa

    You can look at the pistons by pulling the heads or looking through the sparkplug hole to see what kind of pistons are in it....you might not be able to tell exactly what pistons are in it through the plug hole but you'll be able to tell if its a peanut dish, flat top round dish etc... That will tell you the compression ratio, pull the pan and check the numbers on the crank to find out if its a 472 or 500....here is a page that will help http://www.cad500parts.com/catalog/page2.htm

    also don't pass up the later motors... the method motor companies used to rate horsepower changed in 72, or 73 and they went from a theoretical no accessories no exhaust power at the crank rating to ..actuall with accessories and exhuast. and maybe even at the rear wheel...(not sure about that last part)...but anyway the early numbers are not really quite accurate...so power loss isnt that much through the years. Also power drops due to compression ratio is like 4 percent from 7 to 8 and only like 1 percent from 9 to 10...It matters on the dragstrip not sure so much on the street.
    Also if its an early 1970 motor running 10.5/1 compression you may not be happy with the way it runs on pump gas...the later ones will run on 87..and the horsepower loss is not as much as you think especially if your gonna do a cam and headers etc anyway...just a thought
    Jay
     
    Last edited: Apr 8, 2011
  6. squirrel
    Joined: Sep 23, 2004
    Posts: 48,271

    squirrel
    Member

    Yup, the big reason all engines lost 30% of their power in 1972 was the change from "gross" to "net" HP numbers.

    The drop in compression happened in 1971.

    (Eldorado not shown in this chart)
     

    Attached Files:

  7. Deuces
    Joined: Nov 3, 2009
    Posts: 19,928

    Deuces
    Member
    from Michigan

    My old 5600 pound :eek: '74 Sedan DeVille had the 500 cube motor in it.
     
  8. Mr48chev
    Joined: Dec 28, 2007
    Posts: 28,791

    Mr48chev
    ALLIANCE MEMBER

    That is probably a 472 with the front sump pan and the point type distributor.
    No slouch in the power department though.

    I got a 500 out of a 75/76 Ambulance from my buddy for my 71 GMC because I wanted to be comfortable on the crap gas we have now and still have plenty of towing power.
    I had a 76 400 in my 82 Cad Deville coupe for a while and it pulled harder on acceleration than any car I have ever owned including the 48, my T bucket and the 69 Cutlass with a 4 speed I had. Tuned right and in the right body those engines run without a lot of extra tweeking.
     
  9. 73RR
    Joined: Jan 29, 2007
    Posts: 6,551

    73RR
    Member

    472 or 500, hi-comp or low-comp, they will still pull a house off of its foundation...if you can get it to hook up...:eek:


    .
     
  10. jjayf
    Joined: Aug 16, 2010
    Posts: 214

    jjayf
    Member
    from Yelm, Wa

    nice avatar ranger
     
  11. I was going to say that my '72 Eldo had a 472 and it would roast the tires at will. Granted I would have liked to have had the earlier engine but it was more than enough engine to pull that big ol pig around.

    I gave the engine to a kid with a '74 monte because he didn't have any cash and needed to get to and from work and it was one hell of a lot of engine in the monte also.
     
  12. 73RR
    Joined: Jan 29, 2007
    Posts: 6,551

    73RR
    Member


    I was also admiring yours!
     
  13. jjayf
    Joined: Aug 16, 2010
    Posts: 214

    jjayf
    Member
    from Yelm, Wa

    73RR were you up here at Lewis or out in GA?
    (sorry to go off topic but you'll get a bump out of it..)
     
  14. nofin
    Joined: Jan 7, 2010
    Posts: 321

    nofin
    Member
    from australia

  15. JB 472
    Joined: Aug 22, 2006
    Posts: 23

    JB 472
    Member
    from Maine

    Appears to be an early 472 as previously mentioned. It also has a non-EGR intake manifold and solid flex plate. You are looking at a $200 engine right there......

    JB 472
     
  16. jjayf
    Joined: Aug 16, 2010
    Posts: 214

    jjayf
    Member
    from Yelm, Wa

    Yeah seems about right...if your set on a 500 check the crank anyway you could order 500 rear drive cars, or it may have been rebuilt and switched around in the past 40 years as well.
     
  17. randydupree
    Joined: May 19, 2005
    Posts: 660

    randydupree
    Member
    from archer fl

  18. I was going to say look for an egr valve on the late engines..looks like someone beat me to it.
     
  19. Rich Rogers
    Joined: Apr 8, 2006
    Posts: 2,018

    Rich Rogers
    Member

    Pull a valve cover and run the numbers off the head. That's alot easier than goin inside the engine. The weakest 472 was the 1974 and that was the head design, huge chambers and small valves, BUT they still had lots of power
     
  20. 62ironhead
    Joined: Apr 9, 2008
    Posts: 98

    62ironhead
    Member

  21. flynbrian48
    Joined: Mar 10, 2008
    Posts: 7,112

    flynbrian48
    Member

    Amen to that brother! Add 7.50x16 bias plys on a 2,000 lb. car, and have fun! It's certainly worth a 2 hr. drive.

    Brian

     
  22. Pir8Darryl
    Joined: Jan 9, 2008
    Posts: 2,488

    Pir8Darryl
    Member

    68-71 based on the "2 line" fuel pump. Starting in '72, they were 3 line.
    Front sump oil pan indicates it's a RWD 472.
     
  23. Looks original,...so the 4th digit on the carb part # will be the year of production
     
  24. agutto13
    Joined: Feb 20, 2011
    Posts: 156

    agutto13
    Member

    Thank you guys this helped alot! I'm going up tomorrow getting it for 75$
     

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