Possible problems running oversize valves, 472 peanut relief pistons, MTS #15, Potter rockers.

Discussion in 'Big Block Cadillacs' started by DevilDeVille, Jun 13, 2018.

  1. DevilDeVille

    DevilDeVille Active Member

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    When i install my MSD setup, it will be limited on the rev side @ around 4800-5000 rpm. There were no valve float with current unkown springs.
     
  2. Darius

    Darius Well-Known Member

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    How can we help you get "KNOWN" springs for your project? Surely there must be a way.

    Would if help if a 'cousin' currently living in the USA sent them to you? What do you think, Cousin (fill in your name)??

    bro. (cousin) d :sneaky:
     
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  3. DevilDeVille

    DevilDeVille Active Member

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    Was trying to find some info about the head i purchased from ebay, but unfortunately the history goes as far as 2017 :D

    Well, let us see what becomes of this combo, at this point there is so poor weather outside already (road testing made impossible), that there is no hurry for my mechanic to finish the product with what we got until spring arrives. If it ever will :D
     
  4. Cadillac Kid 1

    Cadillac Kid 1 Well-Known Member

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    what is the casting number on the head?
    Greg Surfas
     
  5. JonH

    JonH New Member

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    Good luck I'm just starting a similar situation, having a mechanic build a '68 472 over the winter to put into a different car.
     
  6. DevilDeVille

    DevilDeVille Active Member

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    Hi comp AKA #250
     
  7. DevilDeVille

    DevilDeVille Active Member

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    Funny that You mentioned the cousin theme, i actually have at this point one cousin (albeit twice removed) living in Florida. Seasonally, though, since hi is supporting his sons efforts of graduating univeristy in US.
     
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  8. DevilDeVille

    DevilDeVille Active Member

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    Well, the new (ish) engine is running nicely with new beefier pushrods, old faithful 500 has been removed from under the hood, as well as way too large of a diameter brake booster. Will go with a bit smaller one, that clears the valvecovers. Also, on the menu, will be the removal of antiquated AC unit, that will lead to clean firewall and underdash Vintage Air GenIV unit.
     
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  9. Cadillac Kid 1

    Cadillac Kid 1 Well-Known Member

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    That was the special order "heater delete" option you are talking about?
    Greg Surfas DSCN3603.JPG
     
  10. DevilDeVille

    DevilDeVille Active Member

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    Yup! Smthng like that and the Vintage Air Gen4 unit under the dash, dead centre, in order to obtain equal airflow to both footwells. Also, because of the cracks in cast manifolds that became to my knowledge in yesterday, placed an order for CadCompany-s 77-79 RWD mid-length headers.
     
  11. Cadillac Kid 1

    Cadillac Kid 1 Well-Known Member

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    In all seriousness, the HVAC system in your car is far superior (when it is working correctly) than ANY aftermarket system. Have you considered the heating cycle and what you are going to do for windshield defrosting?
    Greg Surfas
     
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  12. DevilDeVille

    DevilDeVille Active Member

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    My Vintage Air unit has two separate ducts for window defroster, four for in dash outlets and two for front footwells. Controlled by electric servos. Factory unit was dead when i bought the car way back in 2006. Although i bought as many new parts for it as i could get my hands on and "memorized" the HVAC diagnostic section of FSM, i never could get the temperature control blending door to work properly. Vacuum electric programmer error or whatnot. As a "temporary" solution i installed a generic lever operated temperature control valve between the heater core and inlet hose under the hood and just got fed up with it. Purchased the aftermarket kit a few years back just for the occasion of possible future engine swap. And the future seems to be taking place just about now :)

    Best Regards,
    Martin
     
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  13. DevilDeVille

    DevilDeVille Active Member

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    Some pics of some progress
    9B82442B-CFDE-41CE-8DB2-69EE7FAA50C7.jpg FE71C7B7-458D-4D59-A1E5-8FC1EED5035D.jpg C8F1A11F-E38B-4F80-B3FD-4E3FCE58E641.jpg 097397B0-194C-4B25-8C66-E3C6DAEAAA79.jpg 155DBC84-CDFB-4423-8511-CA4A31B150E7.jpg
     
  14. DevilDeVille

    DevilDeVille Active Member

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    Cabin air intake is painted and 480 cid is finally home. Factory windshield wiper motor will not fit anymore, will have to work something out.

    Best regards,
    Martin
    CD1C3FED-17C6-4751-8FDC-CCFF48FA4F46.jpg 480 aistevahel.jpg
     
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  15. DevilDeVille

    DevilDeVille Active Member

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    Well, its alive. Somewhat. Would greatly appreciate an input on the preferred timing curve for my combo on locked out MSD dizzy with 6AL2 Programmable box. MTS#15 cam, KB 10:1 pistons, 472 cid .040 over, Edel 2115 and 800cfm carb, car weighs in at about 4400 lbs, 3.42 rear, th400 with 2000rpm stall turbine, wheel size 275/60r15.

    Best Regards,
    Martin
     

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  16. 5one9

    5one9 Active Member

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    What vehicle(s) do you drive?:
    2007 Magnum SRT8, 1957 F100
    Good looking car. I assume that you mean locked out vacuum advance? I'd lock it back in. 15-ish initial. 34-ish total. Another 10-15 vacuum. It runs so much smoother on the road with vacuum. Hook it straight to manifold vacuum. That should get you started.
     
  17. 5one9

    5one9 Active Member

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    What vehicle(s) do you drive?:
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    Or is the advance in the box?
     
  18. DevilDeVille

    DevilDeVille Active Member

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    The advance is programmable in the box, some 25 degrees of it.
     
  19. DevilDeVille

    DevilDeVille Active Member

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    Got the timing curve set in a manner, that allows the 4400 lbs DeVille to do 0-62 in about 6 seconds. 13 initial@950 rpm, 34 total from 3000-5500rpm. Good enough for me at this point. Next step will be headers and Holley Sniper EFI with timing control and rear suspension upgrade to tubular, poly, del-sphere. Will not happen anytime soon though, since container is not full enough to be shipped out of NC. Windshield wiper motor mounts and one shaft will need to be heavily modified, in order for the motor to clear the valve cover. Also will swap the insufficient 7" single brake booster to 8" dual and hopefully the hood can be closed without further modification/fabrication. So far, so good. IMG_20200326_131208.jpg IMG_20200326_131158.jpg
     
    Last edited: Mar 29, 2020
  20. 5one9

    5one9 Active Member

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    What vehicle(s) do you drive?:
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    You’ve been hard at it. 0-62 in 6 seconds and how much does it weigh? Impressive.
     

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