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500 caddy motor

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 84CUCV, Jan 27, 2004.

  1. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    I got it for 5 bills with the th400. The motor and trans are complete. Anything I should look for? Dont know much about gas motors. Thanks guys mike
     
  2. 90blzr

    90blzr 1/2 ton status

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    Cool!! You sure its a 500? 472's look EXACTLY the same. I know a couple people that thought they had 500's and were 472's. /forums/images/graemlins/rotfl.gif /forums/images/graemlins/blush.gifWhat did you get it out of? You'll need a 3/4 sump or rear sump oil pan to put it into a chevy fullsize./forums/images/graemlins/thumb.gif
    You gonna convert that tranny to a 4wd or just use an adapter plate and run a chevy 4wd unit?

    So you gonna slap it in and run it or rebuild it? Check out www.500cid.com GREAT info there/forums/images/graemlins/thumb.gif
     
  3. bigburban383

    bigburban383 1/2 ton status

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    Very expensive to rebuild is all I know. So hope you dont have to /forums/images/graemlins/waytogo.gif
     
  4. JDBlazer454

    JDBlazer454 1/2 ton status

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    What would you like to know about your new torque pig? What year of Caddy did you get it out of? I am one of the few on here who have done it and still am running mine.

    Doesn't take much to put it into a truck. You can leave the stock oil pan on there as the stock unit (non Eldorado) will give you more clearance then the Eldorado one will. You will also need conversion motor mounts (I maybe able to get you a set for $40) that moves the motor forward 4 inches to help the motor clear the firewall. Get ahold of a good tranny guy to convert the T400 over for you, put your 4wd guts (if your 4wd trany is a T400) into the caddy case then mate it up with whatever Tcase you have. You will have to lengthen your driveline because the whole motor/tranny/tcase all move forward. Hope you kept the stock caddy exhaust manifolds and exhaust collectors and are ready to fab up your own exhaust. Also get a bigger radiator as these motors flow about 15% more then a normal small block and run a tad warm when under load.

    I think I covered all the bases /forums/images/graemlins/smile.gif
     
  5. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    I have a caddi altenator... /forums/images/graemlins/thumb.gif /forums/images/graemlins/ignore.gif
     
  6. 90blzr

    90blzr 1/2 ton status

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    So you CAN use a front sump pan without crossmember interference /forums/images/graemlins/confused.gif
     
  7. JDBlazer454

    JDBlazer454 1/2 ton status

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    Its what I have in mine....front sump /forums/images/graemlins/thumb.gif I did have an El Dorado rear sump on the other 472 (the first one that didn't run, broken timing chain /forums/images/graemlins/eek.gif ) and I have a good amount of clearance with the stock oil pan as the expensive one.

    Check out Cad Company's website and buy their parts catalog it has tons of info in it.

    I also forgot you will need a remote oil filter relocation kit, $70ish from Summit racing, because the oil filter comes out right into the front crossmember and it helps maintain a more consitent oil pressure (mine runs WOT 35 at an idle and 40 at cruisin speed).
     
  8. lukebaby1

    lukebaby1 1/2 ton status

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    472, or 508
     
  9. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    OK...Guys i will need to run the vin i guess. nobody in the yard knows what year it is. How can i tell if its a 500 or a 472? Anything else I need to know guys? This sounds like it is going to cost a bit. Thanks a lot!

    mike
     
  10. JDBlazer454

    JDBlazer454 1/2 ton status

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    [ QUOTE ]
    472, or 508

    [/ QUOTE ]

    Check those web sites Caddy motors from 68-77 came in sizes 425/472/500 and they all used the same external parts the only difference was the internals. Of course just like Chevy's the older the caddy motor the more power and less smogged it would be.

    As for checking numbers get the head casting # I have some of those and could get a good idea of what you have and a general year. Like said before from the outside all Caddy engines are similar in design (small differences like from points dist to HEI) its the internals that makes them unique and they are unique from year to year with different head internals to different compressions.
     
  11. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    thanks guys mike
     
  12. ford_assassin

    ford_assassin 1/2 ton status

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    I've always wanted to put one of those Caddy 500 inch motors in a boat (the water type). They make so much low end grunt that I could use a high pitch prop and have a great top speed while still getting great throttle response thanks to the torque monster motor.
     
  13. Confedneck

    Confedneck 3/4 ton status

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    i have a friend with a 1970 CDV..
    472, th400, funky offset 12 bolt lookin rear end thing..
    he told me i could have it for 600
    only problem is, the car is mint other than needing paint and a front bumper..

    any of you guys interested in the motor?? heh i could always hook someone up..
     
  14. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    To bad you are so far. i would jump on that. mike
     
  15. boz42

    boz42 1/2 ton status GMOTM Winner

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    make sure the casting number on the block has 5200 in sequance in the number if not the block is considered junk by caddy guys. only the 472 & the500 have this number. the only way to tell the m apart is the crank cast # or the stroke.
    caddy crank cast #'s
    425 caddy has 142 in the cast #
    472 has 424 in the cast # & a 4 1/16" stroke
    500 has either 094 or 793 in the cast # & a 4 5/16" stroke

    hope that helps
     
  16. boz42

    boz42 1/2 ton status GMOTM Winner

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    also u don't want a 74 model 472 they are a bastard block of their own

    75 & up have HEI
     
  17. dyeager535

    dyeager535 1 ton status Premium Member

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    Whats the 5200 denote? It's not a mythical strength thing like the "010" and "020" Chev casting numbers, or the "early high nickel Oldsmobile blocks" is it?
     
  18. JDBlazer454

    JDBlazer454 1/2 ton status

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    No its just Caddy's way of saying "Hey I'm a 472 or 500 torque pig!!!!" /forums/images/graemlins/thumb.gif Also all Caddy motors are a high nickel content engine that is what makes them so big but 75 lbs less then a big block chevy, but older is better.

    The casting #'s on the heads are easier to find and decipher...
    950 head #...68-70 472 or 500 (76 cc heads)
    250 or 902 head #...71-73 500 or 70-71 472
    493 head #...74-76 500 or 472 (120 cc heads)
    552 head # ....76 500

    The 950 heads are the most desirable because of the non smog but the 552 also doesn't have the smog rails either but its a post smog engine. Its the pistons that truely make each engine unique as 74 had a pure flat top piston and large cc heads. Not really worth heafting those heads off to have a peak unless your going to rebuild it. I got lucky with both my 472's and got them in their original car, first was a 68 and second was a 71 which is the motor I am still using, both cars were complete and perfect running cars was a shame to scrap 'em.

    Figured out what you have yet?
     
  19. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Waiting to get back into his yard. On monday i hope. i want to get this done. mike
     
  20. elacruze

    elacruze 1/2 ton status

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    Somewhere I have an old Hot Rod magazine with a 500 Caddy buildup...theirs made something like 375hp and 450ft-lbs *stock* and right out of the junkyard, just by taking off all the accessories but the alternator. Without changing anything in the long block, got around 500/650. !! If you want, I can scan it, rent it, or trade it... /forums/images/graemlins/smile.gif

    Eric
     

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