50 Olds 472 build

Discussion in 'Big Block Cadillacs' started by 50olds, Dec 5, 2018 at 5:29 PM.

  1. 50olds

    50olds New Member

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    Hi all,

    A friend mentioned that he had a Cadillac big block out back in the woods for at least 30 years and said I could have it to rebuild for my 1950 oldsmobile. I had been searching for a motor for it that was unique and had potential. I didn't want a sbc or ls or even a bbc. This was my father's car I grew up around it and so is very special. So here we are! I did a bit of research on Cad motors and got bit by the bug...though i have never even heard one run lol.

    Here is the car
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    The numbers on this gem proved it to be a 68-69 472 and even though it has been totally outside except a k10 hood leaned over it since gas was $0.70 there was not a drop of water in it or rust in the bores!
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    The bottom end though...not so lucky. She has some miles and the aluminum cam gear could be used as a weapon and sent shavings through the entire oil system. The owner of this cad didn't believe in oil changes either. The crank is scored and the bottom of the lifters were worn and had to be pounded out the bottom. The cylinder bores look good except a little ridge at the top so I hope to have them ream the ridge, light hone, and re-ring the stock slugs.

    The heads were junk (rusted seats/ broken exhaust bolts) so I bought a ported set w/ bbc valves through fb off a fellow member. You might remember these where he had the issue with a stuck valve from a tight guide. I plan to fix these up and run them. https://cadillacmagazine.com/forums/threads/metal-shavings-after-break-in.18030/page-3
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    My original heads I will sell cheap! #250 castings needing lots of work!!

    I also have a acquired a rtr billet dizzy from another member, a 2115 intake, and custom grind comp cam for a steal off EBay.
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    Cam specs are 231/236 @ .050" and .550 lift with 1.7:1's on a little more aggressive LSA than I wanted: 108*

    I plan to attempt a CSOB rocker setup using the Potter style plate mounting and sbf 1.7 rockers with a girdle. Time is no issue and it is something I could learn from. If it doesn't work out I'll fork out the $$ for Cadco stage 1's. I plan to relocate the pcv and vent locations so I can run olds rocket style wire loom covers that are correct for this engine bay.

    Other plans are I have located a 78' fleetwood limo 425/400 to get the oil pan, oil pump, flex plate and trans from I can get the whole car for scrap value.

    I was also wondering if I should run the 425 crank to save some machining costs? I know they are 11lbs lighter (weaker) but is that a concern with this level build???

    Also plan on putting a speedway motors 9" in the car with like a 300 gear on the stock "truck arm" suspension. My plans are 90% street and 10% track at the local 1/8th mile with the car. It's not as heavy as it looks and I hope to scare/surprise myself and buddies.

    Thanks for reading the big post. Please respond back with your comments. And thank you to all the members that have helped me get this far.
     
  2. Cad Man

    Cad Man Active Member

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    Yes you did steal it.
    I wasnt familiar with how Ebay works..

    Hands down..
    The 425 crank is much wimpier..
    But the 472 block and main caps well support it much better than the 425 block.
    So it's like makin the 425 crank stronger

    That 108 is going to make way more power everywhere that counts than a 112

    I have had 3 425's.
    77 Eldo
    77 Fleetwood
    79 Coupe..

    I ran my 425 from the Edlo to 5000 many many many times.
    I ran the 79's 425 up to 5500 lots of times a few times 5700.. with stock rods and rod bolts... CH thinks the max power a 425 block and crank can handle maybe 500 and that's only with better main caps. I.E 472/500.... 400 hp is probably safe. My 79 Coupe Deville @4600 lbs plus me. with 3.23 posi ran a tire roasting 98 mph in the 1/4. Approx
    380 hp.
     
    Last edited: Dec 6, 2018 at 3:37 PM
  3. 50olds

    50olds New Member

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    It will go to good use and I appreciate it. I will probably just have the original crank ground 10 or 20 under to clean it up unless I run low on cash. I'm waiting until after the holidays to have any machine work done and for now just collecting parts and continuing research.

    So you think the cam will be good I was worried about that. I had read that these motors like 112 lsa to help with top end.
     
  4. Cad Man

    Cad Man Active Member

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    Off the top of my head guess...
    That cam and decent ported heads with headers and a 950 carb will make probably 450 hp with a 472
     
    PJ McCoy likes this.
  5. 50olds

    50olds New Member

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    My buddy at the junkyard messaged me today they just got in a 77' caddy and he's going to sell me the motor/trans for $100! :D Said he is also going to throw in the miami vice cassette they found in the car lol!!
     
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