Valve Springs and Cam Options R/T Heads

Magnum Engine Swaps

  1. 72DMag

    72DMag Well-Known Member

    Messages:
    643
    Likes Received:
    106
    Joined:
    Oct 21, 2019
    Location:
    Pittsburgh
    Local Time:
    12:47 AM
    Building a 360 magnum. Going with the icon pistons like the hot rod magazine build. We found a set of never used R/T heads. The PO stated that he bought the heads with the springs on them already assembled. Can anyone tell me what springs these are and what pressure and lift they are good for so I can select a cam. I'm guessing they are the HP springs?

    I reached out to comp cams and they told me that they don't make any springs for the magnum heads. Is this true or did I get a bad representative?? Curious what spring options I have in case I need to replace the ones on the heads.


    Thanks

    20200505_183040.jpg

    20200505_183049.jpg

    20200505_183055.jpg
     
  2. Demonracer

    Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

    Messages:
    4,410
    Likes Received:
    2364
    Joined:
    Jan 31, 2010
    Location:
    Cleveland, Texas
    Local Time:
    11:47 PM
    I would take the heads to your local machinist to find the specs on your springs. Just MHO. I know these heads were good for 2 tenths on our stock eliminator Dakota. The factory springs would support a .480 lift cam with no problem.
     
  3. mderoy340

    mderoy340 Well-Known Member

    Messages:
    2,403
    Likes Received:
    1191
    Joined:
    Aug 2, 2012
    Location:
    Melbourne FL
    Local Time:
    12:47 AM
    • Like Like x 2
    • RustyRatRod

      RustyRatRod Lemmie see your b00bs. FABO Gold Member

      Messages:
      67,814
      Likes Received:
      42121
      Joined:
      Jun 7, 2010
      Location:
      Georgia
      Local Time:
      12:47 AM
      Is that rust pitting on a couple of those springs? That would rule those out for me right there. "WHICH" Thumpr cam are yall thinkin about? The only accurate way to figure which springs you have is to have the spring pressure and rate tested as mentioned, I am afraid.
       
      • Like Like x 1
      1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
        By continuing to use this site, you are consenting to our use of cookies.