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Technical Chevy 292 head

Discussion in 'The Hokey Ass Message Board' started by Oldfart59, Jun 23, 2020.

  1. Oldfart59
    Joined: Nov 8, 2019
    Posts: 73

    Oldfart59

    I have a 292 Chevy l6 like to put a 194 head on it but I been reading they need a lot of work to flow good has anyone done it
     
  2. Hnstray
    Joined: Aug 23, 2009
    Posts: 11,583

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    @Oldfart59

    I am not sure about 194 heads combustion chamber volumes, but the 230/250/292 heads are all the same and compression is controlled by the dished pistons. I had a warmed up 250 built recently and used the 'lump port' modification to improve head flow.

    Leo Santucci's book on performance building of Chevy sixes is the Bible on the subject and IMO worth the price.

    Ray
     
    tractorguy and High test 63 like this.
  3. Phil1934
    Joined: Jun 24, 2001
    Posts: 2,703

    Phil1934
    Member

    You could get CR increase milling your head
     
  4. Joe H
    Joined: Feb 10, 2008
    Posts: 930

    Joe H
    Member

    Never done it, but read a lot and seen enough to know, the 194 is not the way to go. The ports are all wrong and it takes work to make it work. All you will get is a lot higher compression without the benefit free flowing ports.
     

  5. Oldfart59
    Joined: Nov 8, 2019
    Posts: 73

    Oldfart59

    I read somewhere that they did it but can't find it now
    I know the valve would need to be open up around them
    The intake and the exhaust ports are the same spots so the intake and exhaust will interchange
     
  6. Hnstray
    Joined: Aug 23, 2009
    Posts: 11,583

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    I don’t know about current availability, but pistons for use with LP gas had less dish and, of course, higher compression ratio.

    Ray
     
    Last edited: Jun 24, 2020
  7. Oldfart59
    Joined: Nov 8, 2019
    Posts: 73

    Oldfart59

    No longer can get that I can find so far
    I sent a email to egge to see if they had any thing
     
  8. Casual 6
    Joined: May 25, 2008
    Posts: 239

    Casual 6
    Member
    from Great NW

  9. Oldfart59
    Joined: Nov 8, 2019
    Posts: 73

    Oldfart59

    I went to a shop the guy had a old parts book he looked them up it said low compression pistons for LP but did not say what they were
     
  10. Oldfart59
    Joined: Nov 8, 2019
    Posts: 73

    Oldfart59


    I bought a few parts from Tom he says every .007 you take off the head you gain 1 point of compression

    292 head is 74cc and 194 head is 60.33 cc

    And the stock shim gasket is .019 to felpro .042 so you will lose a lot
     
  11. Mr48chev
    Joined: Dec 28, 2007
    Posts: 27,327

    Mr48chev
    ALLIANCE MEMBER

    The 194 head on a 230 or 250 was the hot lick in the 70's but things have changed a lot since. I plan to put lump ports in my 292 to take advantage of the 4 barrel intake's air flow along with putting a cam with more pop but that is about the limit of the mods I have planned for it.

    When I bought my 48 it had a 194 in it and my former boss JT Carpenter who was one of the performance gurus in Central Texas in the 60's and 70's said to use that head on a larger engine if I wanted it to perform and he had built a late Chevy six in those days that ran circles around a lot of V8 cars on the dirt track.
     
  12. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 6,294

    56sedandelivery
    ALLIANCE MEMBER

    Turbocharge it! SPA Turbo USA makes the exhaust manifold. Years ago (1976?) I build a 250 six and used the #3864883, 194 head (not all 194 heads are the same, this is the one to use). It had "some" work done to it, and the little Nova it was in was a screamer; even with the way-to-big-of-a-cam I had in it. I am Butch/56sedandelivery.
     
  13. Phil1934
    Joined: Jun 24, 2001
    Posts: 2,703

    Phil1934
    Member

    Should be .070 but I wouldn't cut over .050
     
  14. Oldfart59
    Joined: Nov 8, 2019
    Posts: 73

    Oldfart59

    Been thinking about it the turbo manifold is 380.00 from 12bolt and split exhaust manifold are 325.00
    Turbo are not that much I have room for one
     
  15. Oldfart59
    Joined: Nov 8, 2019
    Posts: 73

    Oldfart59

    Yep he said around .040 so the head will keep its integrity
    But I should of check the piston hight before I tore it apart to see how much they stuck down I'm the block
     
  16. Ericnova72
    Joined: May 1, 2007
    Posts: 422

    Ericnova72
    Member

    Every .007" removed from the head is a tenth of a point, 0.1....not a full point for every .007".

    If it was a point for every .007", then an .042" cut would take you from 8.0:1 to 14.0:1, and it ain't the case.
     
    Truckdoctor Andy and ottoman like this.
  17. Countn'Carbs
    Joined: Nov 8, 2006
    Posts: 889

    Countn'Carbs
    Member
    from CO

    That's the path I took. The head on the 292 in my roadster is a 194 head milled .040". We put 1.94 intake and 1.5 exhaust valves in it, lumps with bowl work and unshrouding the valves. The head flows 196 cfm at .500 lift.
    I've been told a 292 head (with the same treatment) will flow better (over 200cfm) but with the larger combustion chamber you'll need to figure out milling and or pistons options depending on what you want for compression.
     
  18. Oldfart59
    Joined: Nov 8, 2019
    Posts: 73

    Oldfart59

  19. Oldfart59
    Joined: Nov 8, 2019
    Posts: 73

    Oldfart59

    As of now my motor only has around 7.34 compression cause of this

    The head is around 72.33 pistons have a dish of 33 cc and a deck clearance of .064 - and a head gasket of .042
     
  20. Mr48chev
    Joined: Dec 28, 2007
    Posts: 27,327

    Mr48chev
    ALLIANCE MEMBER

    GM Herritage center archives say that my 68 292 has 8.0 compression ratio. Still nothing to write home about.
     
  21. Oldfart59
    Joined: Nov 8, 2019
    Posts: 73

    Oldfart59

    They claim that they are 8.25 but mine not even that my pistons are .064 down in the hole
     
  22. Oldfart59
    Joined: Nov 8, 2019
    Posts: 73

    Oldfart59

    Well it will be going to be a turbo motor
    I bought pistons and main studs and rod bolts so far
    Pistons are cast with coated skirts I will get the bottom end done
    Then work on the head cut the 3 devider out and go from there
     

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