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Caddy 500ci in a K5 - Getting serious

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by newyorkin, Jun 1, 2001.

  1. newyorkin

    newyorkin 1 ton status

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    OK, I'm getting into a bad spot here and need some info/help making a decision (sell my j**p for money to buy a parts K5, or trade the J**p to my brother for his caddy?).

    My brother has a '76 Brougham with a 500 in it. The car is pretty hurtin', but the motor is a diamond. I'm trying to convince him to give me the caddy or just the motor/tranny, before he offers the car to his friend (for free! Some brother, huh? He's "loaning it to him so he can keep it breathing until I can restore it". Cripes, at least I'd do something worthy with the body... make it an organ donor!).
    Anyway, I'd heard from this board and several other sources that caddy motors crank out serious torque, more than a 700r4 can handle without blowing up.
    OK, 20 minutes later, here's my question(s):
    What are my tranny options? I know I need BOP or Caddy bellhousing, but what else can handle the torque output and still bolt securely to the transfer case? Can an SM465 handle the torque (supposedly around 550ft-lb)?
    Is there any way to set it up with fuel injection? It is an old motor, and I'd rather do a whole manifold swap than any kind of carb easy-fi-replacement. Is this possible?
    Also, Driveshafts and diff's. Will the existing ones be shredded by this motor? They are currently stock 10-bolts, but I'm going to try and upgrade to D60/14FF as soon as I find a set at the right price.
    Anybody else done this already? Have any photos? Any in progress photos?

    I have more questions but the baby's cryin', and I'm over my cK5 quota for the night!!! Any help is greatly appreciated!!

    Ratch
    **<A target="_blank" HREF=http://k5.8m.com>http://k5.8m.com</A> What more is there to life?**
     
  2. EDdaTREE

    EDdaTREE 1/2 ton status

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    I think there is a link about Caddy motor swaps on the "Chuck's Chevy truck" website. Seem to recall it saying that the 1970 500 cad motors were a torque-beast but are getting rare.


    "The mud is lovely, dark and deep, but I have U-joints to change before I sleep"
     
  3. mpascino

    mpascino 1/2 ton status

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    Well old caddy's were my big thing before I got my blazer. You could build a 700 up to handle the power but take it from me it will be more costly than it's worth. A th-400 should be fine to handle the power even thou a good 350 should work for a while. Keep in mind 400's and TH-425 transmission(front wheel drive version of a th-400) were used behind these motors. What you could do if you wanted to make your life easy is get a drive drain consisting of a th-400 and 205 tcase from a chevy and run an adapter plate to adapt the caddy bolt pattern to the chevy bellhousing. I did the kinda the opposite of what you are doing, I put a small block in my seville. The motor was pushing about 400 HP witht eh torque to match and not once did I have a problem with the motor adapter. The other option that comes to mind is having a BPO bellhousing TH-400 built for a 4x4, but keep in mind this will cost a few dollars, with the adapter plate you could really get everything from a junk yard or other source and keep everything ""bolt in" and interchangable. Hope this helps......

    Oh yeah the fuel injection. I know someone makes a fuel injection system for the 500 but last I remember it was like 2 grand. The only other thing I can remeber out side of what you suggested is this:
    If I remember correctly the caddy 368 engine shared the same style block as the old 500's . Some one tell me if I am wrong on this one. The 368 motor was avaible with TBI injection. I think you might just be able to use the manifold from the 368 motor on the 500 with minor mods. I know the injectors used on the 368 are pretty over kill so they will prob run the 500 decently but they are easily enough changed. I will ask around some of the guys I used to pester about all this to see what else I can find out. If nothig else..... make an adapter plate to go over the 4 bbl intake and convert to the TBI system the blazer uses... GOOD LUCK![​IMG]

    You call that dirty!?
     
  4. mpascino

    mpascino 1/2 ton status

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    also .... Kiss your rear end goodbye!! No way a 10 bolt will like that unless you baby the heck outta it, and take it from me after all that work you are gonna step on it at least once.....the problem with the driveshafts isn't in the shaft it self but the size of the ears for the ujoints. You'll have to get different driveshafts for a 205 t-case anyways so I would go with a set that have the largest u-joint for the application. And the 465 should have no problem with the power.

    You call that dirty!?
     
  5. Jeff427

    Jeff427 1/2 ton status

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    newyorkin, check out my web site at <a target="_blank" href=http://muddog.off-road.ws>http://muddog.off-road.ws</a> and click on the "Caddy Powered Blazer" link to see featured pictures of Donovan Horton's 500 Caddy in his Blazer.

    Jeff427
    <font color=red>Mud Dog Off Road Club</font color=red>
    http://lyonsdesign.bizhosting.com<P ID="edit"><FONT class="small">Edited by Jeff427 on 08/13/01 08:14 AM.</FONT></P>
     
  6. FastEddy

    FastEddy 1/2 ton status

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    I think the Cad 500 would be great in the Blazer....and it's much lighter than a big block chevy....here's a Caddilac swaps message board that's great for advice, etc.....
    http://members.boardhost.com/BadCad/
    I'm not sure how to make it clicky, so you'll have to type it out....I stumbled across it after I got the "Bad Seed" bug from hotrod magazine with the 10 second chevette with the 500 cad in it on a budget...then I went out to see a guy I know with some old Cadillac hearses and limo's etc looking for a motor and he wanted to sell them all in a package....so needless to say I have 2 running 472's, a 1970 500 (yes, the top dog, and she runs nice!!) a running 75 500 (has a stuck lifter or something, bad top end tick) and another 75 500 for parts (siezed).....plus a bunch of rotten Cadillacs for parts (which will be going to the shredder very soon)
    also, if your thinking about going with the 465 4speed, Cadillac never offered a std. trans, so you are at the mercy of the aftermarket for a flywheel, and I think your crank needs to be machined for a pilot bearing/bushing also if I remember correctly....the moderaters of the message board above sell everything you need, along with aluminum intakes, and headers, motor mounts, etc....and are fairly reasonable. also the oil pan is different, they have a front sump unless you use the pan from the front drive eldorado, which has a rear sump, but with a 4x4 I think it may be easier to make a crossmember to work with the pan you have....if you really want to go also put on a set of the 472 heads on your 500....takes the compression way up to like 12.5 to 1 or something, but then pump gas is pretty much useless unless you run octane boost with premium fuel......hope this helps in your Cad conversion....everyone I know who has put one in something loves it....just my 2 cents...ED
     
  7. Ryeguy

    Ryeguy 1/2 ton status

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    The Caddy is a damn good choice.

    And it isn't hard to put in. If you're set on a manual trans, talk to someone like MTS (www.500cid.com) for a custom flywheel. You'll also have to machine the end of the crank for a pilot bearing, though.

    I just put my 472 into my Blazer, mated to a Caddy TH400 converted to a 4wd output shaft. I'd vote with sticking with a carburator, unless you could find the factory TBI system off a 454.

    --Rob
     
  8. newyorkin

    newyorkin 1 ton status

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    Thanks for the response!!

    I'm not dead set on a manual, I just figured that would handle the power the best. The truck is set up for auto as is, so I think I will look into a 400 to maybe modify for a 205. Will it work with a 208? A guy just offered me a 14 bolt, but if I put that in right now, I'm hosed on running 4x4 until I find a matching front (which is a while as my budget shrinks).
    Donovan's motor looks pretty nice.
    I might as well stay with a carb for the initial swap to keep the headaches away from computer problems etc.

    So... I guess I will pass the heep on to my brother... At least he'll have me to recover him out mud pits... Oh, wait, I mean shopping mall...

    Thanks guys!!

    Ratch
    **<A target="_blank" HREF=http://k5.8m.com>http://k5.8m.com</A> What more is there to life?**
     
  9. Ryeguy

    Ryeguy 1/2 ton status

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    Dunno if NP208's came behind TH400's. You'd need a 32-spline intput gear in the NP208, if it was possible. Modifying the NP205 to work with a TH400 isn't hard to do, but would require disassembly to rebore the case to fit the larger bearing for the 32-spline input gear. Converting a Caddy TH400 to a 4wd version also meant disassembly to change the output shaft, but would be straightforward for any trans guy.

    --Rob
     
  10. Sparky87k5

    Sparky87k5 1/2 ton status

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    I installed a 76 Cad 500 in my 88 Sub 3/4 ton 4x4. Had TCI build me a TH400 on BOP bolt pattern and hooked up the stock NP208 to it. Ran a rather modified 500 bored to 513 and lots of after market parts with the Edelbrock intake and 650 Holley. One thing I learned, Cads don't like low rear end gears. What ever you would use with a 454 go higher with a Cad 500. I ran 3.73's for awhile and it was perfect for pulling. Later changed everything to 1 ton axles & 4.56's. Pulled my 29 travel trailerlike a bear up hills but couldn't run over 60 due to HIGH oil temps because the engine has HUGE main bearings and build lots of bearing temp in the oil. I ran a 8 qt. pan & oil cooler but still saw 240-280 temps above 60-65mph. Never saw that with 3.73's. For power, nothing passed me in the hills, including many diesels. BUT everyone passed me at the gas pumps. Most of my parts came from Cadillac Motorsport Development in Florida. They claim 440hp and 600ft.lbs. torque when built to their plans.

    87 K5, D60 & 14FF, 5 sp & NP208 & 383 stroker. Build it Bulletproof and take it fishing!
     
  11. Donovan

    Donovan 1/2 ton status

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    Yes that was a nice running engine. To bad some [censored] had to steal it. It was very simple install and I had under $1000 in it total with the exhaust and tranny rebuild. The best money I could have spent. I found the best place to get parts was MTS. http://albums.photopoint.com/j/AlbumIndex?u=977248&a=7246592&f=0&sp=1 If I can swing it and the rules will let me I will be putting a Caddy engine in my truck and will be using it for truck pulling competition.

    Donovan
    <A target="_blank" HREF=http://www.rustbucket.coloradok5.com>http://www.rustbucket.coloradok5.com</A>
    Bigger is Better
     
  12. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Looking for a BOP TH400? I just happen to have one that I would be willing to part with... Drop me an offer in a private message!

    <font color=red> Check out my truck @ </font color=red>
    <A target="_blank" HREF=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</A> [​IMG]
     

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