Couple of cyl head questions pls

Discussion in 'Engine Topic' started by Pfrederiksen, Feb 29, 2012.

  1. Pfrederiksen

    Pfrederiksen Veteran Member

    609
    0
    Feb 21, 2011
    Edmonton,Canada
    Hey guys,
    I've started my search for a decent head (giggety).
    I found one set which the guy said casting number was 662624.
    Do any of you have any info on that number? I can't find reference to it in the usual sites.
    Also, he says "springs are spot welded for high rpm"
    What the hell does that even mean??
    Should I run away?
    I need to get my comp ratio up for the tunnel ram.
    Thanks for any help.

    P
     
  2. 79powershifter

    79powershifter Veteran Member

    266
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    Apr 22, 2009
    Southgate Mi
    Spot welded springs ? Never heard that one before. Heat will damage springs.
     
  3. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

    8,071
    39
    Nov 4, 2004
    Ringgold, GA
    462624 May be... But, after 1974 they were light weight castings and deserving of a good sprint away from. I've heard of some shade tree mechanical stuff, but never spot welding valve springs...
     
  4. tallman1970

    tallman1970 Veteran Member Lifetime Gold Member

    1,315
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    Jul 31, 2000
    Camas,WA
    Walk away from them or if this is last resort.
     
  5. Pfrederiksen

    Pfrederiksen Veteran Member

    609
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    Feb 21, 2011
    Edmonton,Canada
    Naaa, definately. It last resort. We've got another 400 months of winter here yet. I'm just starting my hunt early.
    I picked up all new ignition, but figure if I've got the intake off, might as well ditch the heads.
    If any of you are close to Edmonton, and have something, let me know.
    Thanks for the help.

    P
     
  6. doc221978

    doc221978 Veteran Member

    355
    0
    Nov 29, 2008
    Allenhurst, GA.
    The 624 heads are not worth the money. They are highly prone to cracking in critical places, and are to fragile for a good porting. Their combustion chambers are 76cc, which yields a very low compression unless you use dome pistons.The worst part is their flow..... they are part the 180 HP 350 and 185 HP 400 because they're so restrictive.

    As for the spot welded springs.... Honestly, I believe he is either giving you a line of BS, or he may be just ignorant. Either way the springs should be replaced. They need to match the cam, and I bet he has no idea of the specs.
     
  7. Twisted_Metal

    Twisted_Metal Moderator Staff Member Lifetime Gold Member

    24,489
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    Feb 26, 2004
    Bloomington, MN
  8. Pfrederiksen

    Pfrederiksen Veteran Member

    609
    0
    Feb 21, 2011
    Edmonton,Canada
    Thanks guys. I'm in no hurry.
    Post em if you gottem.
    They gotta be close enough to Edmonton to make sense shipping.

    Thnx
    P
     
  9. nonstopgo68

    nonstopgo68 Veteran Member

    875
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    Apr 19, 2011
    Mobile, Alabama
    well i guess they welded 'em up because at high rpm you get valve float.
    and if youve seen this with a high speed camera on a whatever -mometer you can see the spring turning in the pocket. a spring will actually machine itself into the head.
     
  10. Pfrederiksen

    Pfrederiksen Veteran Member

    609
    0
    Feb 21, 2011
    Edmonton,Canada
    Ya, but I don't know the "Lincoln locker" thing really applys to a valve spring does it.
    Gotta say, Ive never heard of that one before.

    P
     

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