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Technical 500 Caddy ?s

Discussion in 'The Hokey Ass Message Board' started by anthony myrick, Apr 5, 2018.

  1. anthony myrick
    Joined: Sep 4, 2009
    Posts: 6,621

    anthony myrick
    Member

    just picked up a 75/76 500
    we have it on our run stand at school
    Runs great as pulled from the car.
    nice steady vacuum
    engine looks very clean(under valve covers)
    The oil pressure hot at idle, around 500 rpm, is 15-18,. 40 plus revved up.
    Oil pressure cold is 40+ at idle (still on oil as bought, will change tomorrow)
    The initial compression test (before running up to temp) was 120 +
    seems to be a healthy engine, would like to check the compression numbers to see if they come up any after running.
    We ran it up to around 220 degrees then shut it down........ ran out of class time.
    The plan was to build and put in my bus, now thinking about a re-seal and run as is.
    questions are...... thoughts on running as is with a reseal and what is the normal operating temp.

    This engine will be used to pull a 6500+ pound 'hot rod' around. Torque is the objective
     
    Last edited: Apr 5, 2018
  2. Boneyard51
    Joined: Dec 10, 2017
    Posts: 4,641

    Boneyard51
    Member

    While you have it on a stand, my vote is to take it apart and check it’s condition, fix what’s wrong, new gaskets, put back together. No worries. Just my vote. Bones
     
  3. BJR
    Joined: Mar 11, 2005
    Posts: 6,640

    BJR
    Member

    I have a 1970 472 Cad in my Buick, I just replaced the timing chain and gears and ran it. I would do that on yours for sure, most came with a plastic coated cam gear.
     
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  4. anthony myrick
    Joined: Sep 4, 2009
    Posts: 6,621

    anthony myrick
    Member

    The pan, intake and timing cover will be removed for inspection and gasket replacement.
    Timing chain, water and fuel pumps will be replaced
    Just seems like going further than that may be a waste of money.
     

  5. Boneyard51
    Joined: Dec 10, 2017
    Posts: 4,641

    Boneyard51
    Member

    You just answered your guestion when you said “ may” Bones
     
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  6. RichFox
    Joined: Dec 3, 2006
    Posts: 9,967

    RichFox
    ALLIANCE MEMBER

    If you have the pan off, it makes sense to pull a couple of rod caps for a look. If they look good, put them back and run it.
     
  7. Hollywood-East
    Joined: Mar 13, 2008
    Posts: 1,261

    Hollywood-East
    Member

    I'd say ya got it covered Rite There, Great torque engine! You need 10 psi. Oil pressure for every 1000 rpm to be safe, Ya got it...
     
  8. anthony myrick
    Joined: Sep 4, 2009
    Posts: 6,621

    anthony myrick
    Member

    I’m a little shocked
    All the old engines I end up with need total rebuilds
    This is a first
     
  9. dan c
    Joined: Jan 30, 2012
    Posts: 2,171

    dan c
    Member

    the final versions of this block were the 425 and then the 368. torquey and trouble-free. the replacement was that awful aluminum engine that was barely a step above the vega 4 cylinder. gm should have kept it!
     
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  10. morac41
    Joined: Jul 23, 2011
    Posts: 532

    morac41
    Member

    Hi ... I would definalty replace the cam lifters and timing chain set ...they have plastic type teeth which over time disintegrate and partially block the oil pick up in sump..new sets are all steel... I run 2 of these engines in my cars...cant beat them for power and torque........
     
  11. anthony myrick
    Joined: Sep 4, 2009
    Posts: 6,621

    anthony myrick
    Member

  12. woodbutcher
    Joined: Apr 25, 2012
    Posts: 3,207

    woodbutcher
    Member

    :D Me thinks that engine should drag your bus around just fine.
    Good luck.Have fun.Be safe.
    Leo
     
    anthony myrick likes this.
  13. 120 psi seems healthy for a low compression caddy smog motor. Looks like you got a winner.
    Last 500 I bought had a busted cylinder wall!
     
  14. anthony myrick
    Joined: Sep 4, 2009
    Posts: 6,621

    anthony myrick
    Member

    we changed the oil
    20-25 psi on idle at running temp, hits 50+ on a rev, holds 45
    doesn't smoke
    need to locate or build a rear sump pan
     
    1956DODGESEIRRA likes this.
  15. 1934coupe
    Joined: Feb 22, 2007
    Posts: 4,193

    1934coupe
    Member

    I would change the timing chain and sprocket along with seals and gaskets and leave everything else alone,

    Pat
     
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  16. BoilermakerDave
    Joined: Mar 3, 2016
    Posts: 267

    BoilermakerDave
    Member
    from Las Vegas

    I belive Eldorados had rear sump pans. Great engine.
     
    dan c likes this.
  17. I picked a similar 500 up a while ago, just waiting for a project to come along I can put it in. A bunch of those motors went south for the air boat crowd and Florida is a good parts source.
    The Cadillac Power Forum is a great source for info, not a lot of traffic but very knowledgeable guys.
     
    Last edited: Apr 6, 2018
  18. anthony myrick
    Joined: Sep 4, 2009
    Posts: 6,621

    anthony myrick
    Member

    thats the plan
     
    shawnsauto1 and 1934coupe like this.
  19. MMM1693
    Joined: Feb 8, 2009
    Posts: 528

    MMM1693
    ALLIANCE MEMBER

    Sounds to me like you have a pretty healthy motor. Keep to your plan of timing chain, fuel pump, and water pump and you should be good. These motors will run from 190 to 205 water temps all day with no worries. If you keep the stock rocker system keep her under 4000 rpm. The Edelbrock intake will also give you a little boost if you have room. Get yourself a copy of the book Big Inch Cadillac, I know Speedway has them, lots of good info. Also for good info on these motors contact Paul at Cad 500.com. Knows his stuff and stands behind it. Also a good source for new and some used parts. Hope this helps and good luck!
     
  20. Atwater Mike
    Joined: May 31, 2002
    Posts: 10,305

    Atwater Mike
    ALLIANCE MEMBER

    My bud Bonneville Butch runs two 500 Cads, tandem style in his streamliner. (314 MPH+, two way)
    He had a 472 in his '72 Ford pickup, but was surprised that it would labor pulling the heavy streamliner on the 2 wheel Cat trailer! Took wife Joey and me for a ride...Butch laughed as he stated it felt just like the 360 Ford. He and I had collected 500" Cads for months, he had 7 or 8.
    The 'liner began with an 8-71 blown 392, and a couple of other hemis of less C.I., for class.
    The Cads in tandem were planned from the first, Hemis were really 'shakedown' engines.

    So out with the 472, and in with a 500. Stock. Steel timing gear, new water pump.
    Night and day. The truck now pulls the 'liner at 90 on the flat, (easy) and hardly slows up the long grade.
    Butch's shop is in San Jose, CA.
     
  21. anthony myrick
    Joined: Sep 4, 2009
    Posts: 6,621

    anthony myrick
    Member

    curently debating if the edelbrock intake is worth the investment
    plan to use a 1 inch phenolic spacer if the stock intake is used
     
  22. anthony myrick
    Joined: Sep 4, 2009
    Posts: 6,621

    anthony myrick
    Member

    the 500 will end up in this
    wow bus 1.jpg
    the current 350 struggles on hills loaded with people
    hope this 500 will cure that, I dont need speed just more torque
     
  23. 26Troadster
    Joined: Nov 20, 2010
    Posts: 586

    26Troadster
    Member
    from Texas

    boilermakerdave hit it the old eldies had the rear sump. i have also been told that the 429/460 ford intakes will fit to but i don't know if you have to have a adapter or not. that is what they run for the tunnel ram motors.
     
  24. anthony myrick
    Joined: Sep 4, 2009
    Posts: 6,621

    anthony myrick
    Member

    yep, the adapter is neeeded
    would be an option if I was to put the 671 on it
     
  25. RichFox
    Joined: Dec 3, 2006
    Posts: 9,967

    RichFox
    ALLIANCE MEMBER

    I haven't seen Paul in years. How's he doing? Tell him I said Hi. Don't forget the Specter streamliner with one 472 went 356 mph on gas. I think I remember a 400 + one way run.
     
    Last edited: Apr 6, 2018
    kidcampbell71 likes this.
  26. The fellow at CAD Company told me to not buy the intake if not doing head work. I was pretty impressed that he talked me out of buying an intake from him because he felt that would I be wasting my money.
     
  27. 1946caddy
    Joined: Dec 18, 2013
    Posts: 1,705

    1946caddy
    Member
    from washington

    Care to expand on the reason he gave.
     
  28. ROADSTER1927
    Joined: Feb 14, 2009
    Posts: 2,824

    ROADSTER1927
    Member

    I had a 500 in my 70 chevy short box step side pickup and put the aluminum intake on it after running it stock a while. It really woke it up and was definitely worth it to me!:D
     
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  29. southcross2631
    Joined: Jan 20, 2013
    Posts: 4,110

    southcross2631
    Member

    I built a 500 Caddy for an O/T G-Body Malibu. Honed it and re ring and bearing overhaul. Did some head work and bought a Maximum torque specialties cam kit. Ported the intake and exhaust manifolds.
    With a 2.41 gear and stock convertor it ran 13's in the 1/4 and got around 16 mpg at freeway speeds.
    Drove it back and forth to work everyday for a year before a co-worker bought it from me and back halfed it and made a bracket car out of it. He also put a set of early small chamber heads which bumps the compression over 11 to 1. He built a home made tunnel ram. Ran low 7's in the 1/8th foot braking it.
    Bought another 500 and just put a timing chain and gears and installed it in a long bed C-10 to tow my dirt track car . Pulled it great.
     
  30. anthony myrick
    Joined: Sep 4, 2009
    Posts: 6,621

    anthony myrick
    Member

    looks like I got my moneys worth
    a dollar per cubic inch

    anyone need a used TH400?
     

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