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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. Is this still an offer to do the work? Am putting together another 390 to replace the 331 in my 40. Will run a EDMUNDS 2x4 with early AFBs Custom ground Schneider cam/lifter with adjustable PRs Better valves and springs in 390 heads. 471 later on. If so, prices and order ship time? Have a 59 390 in my Roadster and love it. Have had the 331 in my coupe since 73.
     
  2. Roothawg
    Joined: Mar 14, 2001
    Posts: 21,118

    Roothawg
    Member

    I would be interested as well Mike.
     
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  3. swissmike
    Joined: Oct 22, 2003
    Posts: 1,297

    swissmike
    Member

    Just a quick update on my 331 build: I installed the heads after decking with new composite gaskets and checked the preload of the lifters by marking them with a flat scribe with the lifter sitting on the heel of the cam. Then repeated the marking with the rocker shaft assembly removed / loosened.

    IMG_1520.JPG

    IMG_1521.JPG

    IMG_1523.JPG

    The preload measured .100-.120”, which is a little much but reasonable assuming the motor has been rebuilt and machined at least twice.
    I made some temporary shims of .048” material which brought the preload down to .030 -.050” which seems about right. .020-.060” is a number for SBC. Does that sound ok?

    IMG_1529.JPG


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  4. Roothawg
    Joined: Mar 14, 2001
    Posts: 21,118

    Roothawg
    Member

    I have done a lot of research and can't find any difference between the sbc lifters and Caddy lifters. I think the preload sounds right.
     
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  5. lumpy 63
    Joined: Aug 2, 2010
    Posts: 1,397

    lumpy 63
    Member

    Bump for the new year
     
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  6. Roothawg
    Joined: Mar 14, 2001
    Posts: 21,118

    Roothawg
    Member

    @MikeD some of the guys might be interested in the oil pump mod, if you wanna shoot me a price.

    Root
     
  7. Roothawg
    Joined: Mar 14, 2001
    Posts: 21,118

    Roothawg
    Member

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  8. tuff57
    Joined: Mar 5, 2008
    Posts: 15

    tuff57
    ALLIANCE MEMBER
    from wantagh

    Here’s some of my 54 331 that I’m putting together for my model a. I found it on marketplace The next town over and have slowly been having it machines and collecting parts over the last six months. Hoping to have it running by the end of the summer. We’re using bbc rods and custom je pistons. I have the valve information written down somewhere if anyone wants.

    I have read pretty much every caddy related thread on this forum and I remember someone cross referencing head bolts to arp, would anyone happen to have those numbers or specs?


    IMG_6519.JPG IMG_5699.JPG IMG_5525.JPG IMG_5526.JPG IMG_3885.JPG IMG_2910.JPG


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    Last edited: Feb 24, 2021
  9. Roothawg
    Joined: Mar 14, 2001
    Posts: 21,118

    Roothawg
    Member

    I know that there is a kit for the mains, but I don't know if there is one for the head bolts.

    Cadillac 331-365-390 1949-'62
    Main Bolt Kit
    117-5001

    I did find the rod bolts if you are interested.

    Rod Bolt Kit
    Cadillac 390 V8
    Kit #: 117-6001
     
    Last edited: Feb 24, 2021
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  10. Would like head/valve/and spring info. Thanx Davey
     
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  11. Putting together a pair of 331 heads.
    I'm looking to use SBC valves becuase of availability and price.
    From initial measurements the Chevy valve is about 1/8" longer than the Caddy valve, which makes a mess of the rocker geometry.

    What is the process for using Chevy valves? Reduce valve height? Shim rocker stands?

    Thanks.
     
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  12. Anybody used ARP main bolt kit?

    The ones I recieved are nothing like the originals!

    Have I got the wrong bolts in the box or am I missing something?

    [​IMG]
     
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  13. I used them on my '62 390 with no problems. But, if that is a stock main cap bolt on the right I'd say the ARP bolt on the left might be a little long. The stock bolts that came out of mine measure 3-3/8" long...
     
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  14. Yes, ARP on left, stock on right.
    I've tried them and they are too long for the main caps.

    The ARP's are 1/2" longer with the extra length all being in the shank.

    Spoke to ARP and they think the early motors have a different length main bolt to the later (390?) Caddy motors.

    They are sending me out shorter ones to hopefully solve the problem.

    Top marks to ARP so far for there customer service.
     
  15. Roothawg
    Joined: Mar 14, 2001
    Posts: 21,118

    Roothawg
    Member

    @42merc any pics of the way you set up your P/S?
     
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  16. 31hotrodguy
    Joined: Oct 29, 2013
    Posts: 2,662

    31hotrodguy
    ALLIANCE MEMBER

    Good question! Inquiring minds want to know!


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  17. Stan Back
    Joined: Mar 9, 2007
    Posts: 923

    Stan Back
    Member
    from California

    Phil's Wagon.jpg

    This is a little off the technical thrust of this thread -- but probably of interest to Cadillac-engined car owners. In 1972 Phil Stevenson drove this 55 Chevy wagon to Bonneville. It had a 390 Cad in it along with the "high performance" Jet-Away trans. It had a 6-pot manifold with four 97s that I supplied from my bucket of a dozen or so. This is a shot when we first arrived. He had two 18" racing tires on Halibrands to up the gearing. One, I guess was an old Indy tire, the other was an old Bonneville tire. They both had cords showing through, but were stamped "OK for 175 MPH". One was about 3/4" taller that the other. He wanted to run 150 MPH as he'd run in the low 120s at El Mirage previously, again driving it up there from his home in Rialto, California. Well, he didn't make 150, but made a best of 149 as I remember. He also won an award the SCTA used to have for the fastest car driven to the salt. That award was, in my opinion, later bastardized by competitors who unloaded outside of Wendover and "drove" to the salt. But that's another story.
     
  18. 31hotrodguy
    Joined: Oct 29, 2013
    Posts: 2,662

    31hotrodguy
    ALLIANCE MEMBER

    Stan Back, thank you for the story and pictures!!


    Sent from my iPhone using H.A.M.B.
     
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