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Technical 1954 Chevy 235 Engine Help

Discussion in 'The Hokey Ass Message Board' started by cspecken, Jul 17, 2016.

  1. cspecken
    Joined: Oct 8, 2010
    Posts: 14

    cspecken
    Member
    from California

    I am working on a 1946 Chevy Pickup truck that currently has a 1954 Chevy 235 installed. I am trying to determine what to do with a vacuum port attached to the exhaust manifold and another line coming out of the head (see photos). Can I block off the vacuum port and seal up the hole in the head?

    Also does anyone now if someone makes throttle linkage for a conversion like this? I have seen a couple of discussions on line about customizing the existing linkage.

    Any help would be greatly appreciated.


    [​IMG] [​IMG]
     
  2. Dave Downs
    Joined: Oct 25, 2005
    Posts: 915

    Dave Downs
    Member
    from S.E. Penna

    The first photo looks like the vacuum for the windshield wiper motor, intake manifold, not exhaust. Block it off if you don't have vacuum wipers (which a '46 truck would have)

    Second photo looks like oil line, possibly for oil pressure gauge.
     
  3. 302GMC
    Joined: Dec 15, 2005
    Posts: 7,213

    302GMC
    Member
    from Idaho

    If your '46 gauge is hooked up, put a pipe plug in the head. Pull the valve cover & check for rocker oiling, as mixing early/late heads & blocks can cause trouble. The throttle linkage is made from the '46 parts, pedal to the pivot - may need bending or lengthened from there. It's fairly easy when you look at it ...
     
    Last edited: Jul 17, 2016
  4. cspecken
    Joined: Oct 8, 2010
    Posts: 14

    cspecken
    Member
    from California

    Thanks for the info.
     

  5. 325w
    Joined: Feb 18, 2008
    Posts: 5,768

    325w
    ALLIANCE MEMBER

    Didn't sometimes the fitting in the head get used for extra rocker oiling?
     
  6. 325w is right, that extra fitting on the head is used for rocker oiling. I have one on one of my 235's, but have never seen another like it until now. I can post a pic of the connection on the other end if you want. I would re-connect it, or investigate what killed the internal oiling system. If the inside oil circuit is the same as a stovebolt, it was a very thin tube (1/8" or less), and can get pinched off easily inside the engine.
     
  7. e z i
    Joined: Sep 5, 2007
    Posts: 584

    e z i
    Member

    This setup keeps the rockers happy in my '51 3800. Block numbers say it's a 56 235.. IMAG0294.jpg
     
    302GMC likes this.
  8. junkyardjeff
    Joined: Jul 23, 2005
    Posts: 8,245

    junkyardjeff
    Member

    A slot through the threads of the head bolt near that fitting will eliminate the need for the oiler.
     
  9. banditomerc
    Joined: Dec 18, 2005
    Posts: 2,368

    banditomerc
    Member

    Junkyardjeff, a diagram to match ur discription would be great ...
     
  10. junkyardjeff
    Joined: Jul 23, 2005
    Posts: 8,245

    junkyardjeff
    Member

    Just take a die grinder with a cutoff wheel and grind a slot about 1/8 deep through the threads and it will get oil,I had to do that to get oil to the rockers on my 57 235. I eventually went with a drilled head bolt that I found in a motor at the junkyard and when the motor comes out I will take head back off to see just where the problem is so it can be fixed right.
     
  11. How does the oil get into the rocker shaft? Wouldn't the oil just dribble back down the surface of the head into the drain holes?
     
  12. junkyardjeff
    Joined: Jul 23, 2005
    Posts: 8,245

    junkyardjeff
    Member

    There is a passage in the head around the center head bolt where it gets the oil and yes it goes down the drain holes.
     

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