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Hot Rods Let's talk Cadillac 331's, 365 and 390's

Discussion in 'The Hokey Ass Message Board' started by Roothawg, Apr 7, 2016.

  1. Roothawg
    Joined: Mar 14, 2001
    Posts: 24,746

    Roothawg
    Member

    I would take that estimate with a grain of salt...
     
  2. Arekusu
    Joined: Nov 3, 2008
    Posts: 36

    Arekusu
    Member

    Nice article find. I'm interested in how they are doing the oiling for that RPM range...Interesting. In one of the last pictures there is an odd aluminum piece with x2 roughly -8An size tubes traveling the length of the block. What might that be - fuel related?

    Also agree that 3000 HP is likely impossible considering the flow restriction / bottle neck that GMC 4-71 is going to make. I'll be surprised if it makes it to 8500 RPM too. But I've also never used Nitro.
     
    loudbang and Roothawg like this.
  3. Roothawg
    Joined: Mar 14, 2001
    Posts: 24,746

    Roothawg
    Member

    I just wish there was a machine shop like that around here.
     
    winduptoy likes this.
  4. Interesting, what got my attention was the use of the sbc timing set. Wonder what modifications had to be done to get that to fit...

    Also I rebuilt the oil pump for my 331 and tested the relief valve today. Using the original valve and spring with a .135 spacer gave me 40 psi and with a .270 spacer it opened at 60 psi. That's about what I wanted, but may play with it a bit more tomorrow.
     
    Last edited: Mar 3, 2024
    Roothawg likes this.
  5. Roothawg
    Joined: Mar 14, 2001
    Posts: 24,746

    Roothawg
    Member

    I picked up on the timing set deal also. I’ve been wondering about that for a while.
     
    warbird1 likes this.
  6.  
    warbird1 likes this.
  7. About what I figured... too much trouble for this old guy to deal with.
     
  8. Arekusu
    Joined: Nov 3, 2008
    Posts: 36

    Arekusu
    Member

    I assumed this was due to the SBC crank snout change?
     
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  9. Roothawg
    Joined: Mar 14, 2001
    Posts: 24,746

    Roothawg
    Member

    Yep. I am guessing so, since the chenged it for the 4-71.
     
  10. Good article but 3000hp and a 8500 redline, yeh right oh. LOL!
     
    loudbang likes this.
  11. Does anyone know the difference between an AC and non-AC equiped harmonic balancer for a '55 331?
    I believe the AC equiped cars had a double pulley groove (?) but not sure why the balancer itself would be different? They are always listed seperatly with the suppliers.
     
  12. 51box
    Joined: Aug 31, 2005
    Posts: 1,103

    51box
    Member
    from MA

    I wanted to add a little info here to maybe help someone in the future. I bought a Schneider cam and valve springs part number 6710. To get the install height pressures correct they would have needed an average of .110- .125 worth of shim. The machine shop had a set of SBC retainers and tried them and because of the design they made up for .110 worth of height difference alone. Also the caddy keepers fit the Chevy retainer.
    Stock 365 caddy retainer on the left and the SBC retainer on the right. IMG_0044.jpeg IMG_0043.jpeg
     
  13. Anyone know of a source for good, made in USA lifters for the 49-55 331 engines? Just bought a set of Elgin lifters from evil bay and they are "Made in China"... I used Hylift-Johnson in my 390, but they don't make anything for the earlier engines.
     
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  14. Roothawg
    Joined: Mar 14, 2001
    Posts: 24,746

    Roothawg
    Member

    I was planning on just using all SBC stuff on mine. I am going to changed the guides and cut them for a positive umbrella style seal. Those clunky Caddy retainers have to go. I just need to see what springs I can make fit. What was the diameter on your springs?
     
    Last edited: Mar 17, 2024
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  15. 51box
    Joined: Aug 31, 2005
    Posts: 1,103

    51box
    Member
    from MA

    My guides are cut down 1/2” in height and also cut for umbrella seals. I don’t know for sure, but think they are a “z28” style spring, 1.26 OD
     
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  16. 51box
    Joined: Aug 31, 2005
    Posts: 1,103

    51box
    Member
    from MA

    Also in that picture I posted those are the original style springs I used to brake the cam in, The ones I’m running have thicker wire and a flat damper spring.
     
    Roothawg likes this.
  17. Still looking for usable lifters! Sent the Chineseium Elgins back to the vendor. Have found a set of "lightly" used Perfect Circle lifters but am just as afraid of using them as I was of the new Elgins...

    Was hoping to have this engine back in my roadster this week but am hung up due to the lifter issue.
     
  18. Roothawg
    Joined: Mar 14, 2001
    Posts: 24,746

    Roothawg
    Member

    Lightly used is still used. That's just as bad. No way I would try that. You have too much invested.

    I'm sure you have done this already, but I sent an email to Caddy Daddy asking where his are manufactured.
     
    Last edited: Mar 20, 2024
    warbird1 likes this.
  19. And what was Caddy Daddy's answer? I honestly don't trust anything from Egge, Caddy Daddy, Kanter and the rest regarding their lifters anymore.
     
  20. Roothawg
    Joined: Mar 14, 2001
    Posts: 24,746

    Roothawg
    Member

    Nothing yet. I just sent it after reading your post.
     
  21. wrenchbender
    Joined: Sep 5, 2007
    Posts: 2,356

    wrenchbender
    Member

    I sent my lifters for my flatcad to Oregon cam and had them resurfaced I figured the original ones were better than any new ones you might give them a call they were real nice and done great work in a timely manner for a reasonable cost
     
    Moriarity likes this.
  22. Roothawg
    Joined: Mar 14, 2001
    Posts: 24,746

    Roothawg
    Member

    Here is the response from Caddy Daddy.

    Our manufacturers do not share with us actually where they are made once in a while we get NOS or NORS but if it’s not on our website now we don’t have it chances are they are made overseas because I don’t think that any manufacture in the US or Canada makes these.
     
    kadillackid and warbird1 like this.
  23. Yeah, I think that's what I'm going to have to do. Sending e-mails regarding this to both Oregon and Delta now. I have a spare cam laying around that I'll have re-ground at the same time.
     
    kadillackid likes this.
  24. Arekusu
    Joined: Nov 3, 2008
    Posts: 36

    Arekusu
    Member

    Question about 331, 365, and early 390 Cad oiling. Do we know if the oil pressure coming from the block to the external oil filter is still under decent / significant pressure? I need a pressurized engine oil source.. I'm thinking of using this as a supply prior to filtration to the TP oil filter.

    - Alex
     
  25. It's under sufficient pressure to make it hard to get the lid of a stock canister filter to seal, no matter how tight the center bolt is. I finally put a restrictor in the fitting at the oil gallery to reduce the pressure on the filter. ala flathead Ford...
     
    loudbang likes this.
  26. Anyone have any luck finding main bearings in .010 or .020 for a 331 (he really needs .010). I have a friend that's looking for them and can only find .030 and doesn't want to grind a good crank that low, since the crank was ground to .010 already.
     
    Last edited: Mar 24, 2024
    warbird1 likes this.
  27. Arekusu
    Joined: Nov 3, 2008
    Posts: 36

    Arekusu
    Member

    Thanks for this info. This is what I was hoping for.
     
  28. Mike Paul
    Joined: Oct 10, 2003
    Posts: 999

    Mike Paul
    ALLIANCE MEMBER

    what engine? They take different bearings. I have 331 .020 rods and mains. And a freshly ground crank
     
  29. Mike Paul
    Joined: Oct 10, 2003
    Posts: 999

    Mike Paul
    ALLIANCE MEMBER

  30. Yeah, I spaced....it's a 331.
     

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