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Technical Walker rad cap?

Discussion in 'The Hokey Ass Message Board' started by Phil P, Jul 3, 2020.

  1. Phil P
    Joined: Jan 1, 2018
    Posts: 492

    Phil P
    ALLIANCE MEMBER

    Hi everyone

    I've got a walker c-487-2 cobra rad in my model A and I want to go down to the local parts place and pick up the pressure cap for it, what car should I tell them it's for.
    Thanks in advance, Phil
     
  2. It's just a regular cap, you just need to decide which psi cap you want. HRP
     
  3. jimmy six
    Joined: Mar 21, 2006
    Posts: 14,795

    jimmy six
    ALLIANCE MEMBER

    If your running a recovery tank fill the rad to the top. If not leave 1” down. I run a Coolcraft modern 3 row which can stand 29+ psi but a mid 50’s engine and heater so I use a 7 psi cap, a 170 thermostat, and no overflow tank. Never overheats in heavy traffic and 95* days. The rest of the system is in excellent condition. Fan shroud, 6 blade mechanical fan, and correct diameter water pump pulley.
     
    Elcohaulic likes this.
  4. AVater
    Joined: Dec 9, 2008
    Posts: 3,147

    AVater
    ALLIANCE MEMBER
    1. Connecticut HAMB'ers

    You will also want to think about the effect of higher psi on the water pump(s). Newer/rebuilts with better seals better able to hold a higher pressure than the older originals.
     
    jimmy six likes this.

  5. catdad49
    Joined: Sep 25, 2005
    Posts: 6,396

    catdad49
    Member

    Check Walker's web site, should be a recommendation there.
     
    Budget36 likes this.
  6. Phil P
    Joined: Jan 1, 2018
    Posts: 492

    Phil P
    ALLIANCE MEMBER

    Unfortunately the only thing you find on there website is is a listing for their caps at $24.50 each, of course this is before exchange, shipping and brokerage.

    Because of the border closure I had to limit my US orders.

    Phil
     
    Last edited: Jul 5, 2020
    catdad49 likes this.
  7. catdad49
    Joined: Sep 25, 2005
    Posts: 6,396

    catdad49
    Member

    Phil, I was referring to a pressure designation (15-18). Once you know that, find your preferred cap, whether standard or a custom one.
     
    Last edited: Jul 5, 2020
  8. 54vicky
    Joined: Dec 13, 2011
    Posts: 1,599

    54vicky
    Member

    catdad gave you your answer
     
  9. 53 hemi
    Joined: Jan 8, 2009
    Posts: 501

    53 hemi
    Member

    For what it's worth, I used Walker's recommended cap pressure and blew out the seal on my water pump. I'm using a cap with the recommended pressure for my engine (service manual) now and all is well.

    Sent from my SM-G950U using The H.A.M.B. mobile app
     
    dana barlow likes this.
  10. dana barlow
    Joined: May 30, 2006
    Posts: 5,115

    dana barlow
    Member
    from Miami Fla.
    1. Y-blocks

    There was a batch rad cap cups*,that were about 1/8in. deeper then normal and many of those used on fuller neck add ons to replace hose inlet of SBC intakes for cap above thrmostat. There were extra deep caps made that fit them. Other wise a spacer had to be used. That weird thing happen around 20+ years back.
     
  11. Budget36
    Joined: Nov 29, 2014
    Posts: 13,173

    Budget36
    Member

    Or maybe, I dunno....just maybe, talk to Walker?

    Then again I'm odd like that.
     
    Hnstray likes this.
  12. Elcohaulic
    Joined: Dec 27, 2017
    Posts: 2,212

    Elcohaulic

    I use the 7 pound cap on everything...
     
    Gman0046 likes this.

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