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Technical Hole above oil filter on SBC

Discussion in 'The Hokey Ass Message Board' started by Greasyman, Jun 23, 2021.

  1. Greasyman
    Joined: Oct 23, 2010
    Posts: 174

    Greasyman
    Member

    I bought a Chevy crate engine and I noticed there is a threaded hole just above the oil filter. What is this for?
     
  2. Belle53
    Joined: Aug 13, 2019
    Posts: 39

    Belle53

    i believe clutch linkage
     
    Deuces and Lloyd's paint & glass like this.
  3. 325w
    Joined: Feb 18, 2008
    Posts: 5,563

    325w
    ALLIANCE MEMBER

    Could be for oil sender. Maybe show us a picture.
     
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  4. trollst
    Joined: Jan 27, 2012
    Posts: 2,019

    trollst
    ALLIANCE MEMBER

    Oil sender, oil with come out if you fire it.
     
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  5. Jmountainjr
    Joined: Dec 29, 2006
    Posts: 1,354

    Jmountainjr
    ALLIANCE MEMBER

    A pic would help. Many blocks had one or two locations for the clutch pivot ball, one of which is above the oil filter boss. A clutch pivot ball hole would be a SAE course thread and an oil hole would typically be 1/8" NPT, so pretty easy to tell them apart.
     
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  6. Fordors
    Joined: Sep 22, 2016
    Posts: 3,550

    Fordors
    Member

    If the hole is threaded 7/16-14 it's for a clutch linkage ball, but if you are referring to a hole centered in line with the oil filter that should have a 1/4' NPT plug in it. That horizontal hole gets oil from the filter and feeds the main bearings and the top end of the engine.
     
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  7. squirrel
    Joined: Sep 23, 2004
    Posts: 48,691

    squirrel
    Member

    and what the oil hole is for, depends on what you're installing the engine in. In some Chevys, it's for an oil pressure switch or sending unit. In others, it's to be plugged.
     
  8. Mr48chev
    Joined: Dec 28, 2007
    Posts: 29,086

    Mr48chev
    ALLIANCE MEMBER

    I am thinking that they are in every small block (except early engines that had bypass filters) and that that was the access point to drill the cross gallery between the gallery from the oil pump and the oil filter. SBC oil gallary.jpg
     
    427 sleeper and squirrel like this.
  9. Greasyman
    Joined: Oct 23, 2010
    Posts: 174

    Greasyman
    Member

    Thanks for the help. It seems it is for the clutch mechanism, which I didn't realize because I'm using an auto. It's "B" in this photo.

    [​IMG]
     
    Desoto291Hemi likes this.
  10. Yep, looks like the hole for the Z-bar stud. There is a matching hole in your pic, on the bell housing itself to be used for different applications.

    [​IMG]
     
  11. MARKDTN
    Joined: Feb 16, 2016
    Posts: 96

    MARKDTN

    Pretty sure "B" is also oil pressure.
     
  12. Dennis D
    Joined: May 2, 2009
    Posts: 716

    Dennis D
    Member

    If it is for the clutch ball stud, It should go all the way through into the housing. Should be able to see the torque converter through it. Don't think I have seen one with a blind hole. D
     
    Last edited: Jun 24, 2021
  13. silent rick
    Joined: Nov 7, 2002
    Posts: 4,295

    silent rick
    Member

    i intend to use that hole and the one in the bellhousing to mount a bracket for a hydraulic slave cylinder to push on the fork
     
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  14. Dennis D
    Joined: May 2, 2009
    Posts: 716

    Dennis D
    Member

    I used that on my car. Works well. clutch slave.JPG
     
  15. silent rick
    Joined: Nov 7, 2002
    Posts: 4,295

    silent rick
    Member

    this is a bracket brian bass made for the wade coupe.

    4116729562_c3d8bd3cf9_o.jpg
     
  16. That is one good looking bracket,,,,,I also like the anti rattle spring bracket mounted outboard as well .
    Looks very good ,,,,,,,although I would have doubled the thickness of the base metal.
    That cylinder is under quite a load,,,,pressure wise,,,,,,should work fine though.

    Tommy
     
  17. silent rick
    Joined: Nov 7, 2002
    Posts: 4,295

    silent rick
    Member

    it is neat. i asked brian if he would mind if i copied it. i have given thought to using 1/4 inch material for the base.
     
    Desoto291Hemi likes this.

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