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Technical 59A manifold on an 8BA

Discussion in 'Traditional Hot Rods' started by Ron Plumlee, Nov 2, 2020.

  1. Ron Plumlee
    Joined: Feb 12, 2012
    Posts: 130

    Ron Plumlee
    Member

    SO I have #4 and #8 dead at idle....and have checked every possible cause..honest. Question: anybody running early manifold on an 8BA? I am thinking about angle of block since the valve angle changed, maybe just maybe a manifold leak internal is the cause? The manifold is an Eddie Meyer repop, 2X2, brand new real 97s. Have eliminated electrical and mechanical possibles.
     
  2. dudley32
    Joined: Jan 2, 2008
    Posts: 2,117

    dudley32
    Member

    I ran an early Edlebrock high rise two deuce on a 8ba with no problems other than oiling my firewall
     
  3. Have you tried a vacuum gauge? At idle, there should be a high and steady reading. Any leak would show up.
     
  4. Budget36
    Joined: Nov 29, 2014
    Posts: 4,896

    Budget36
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    Have you put a timing light on those wires and see if it flashes?
     

  5. 42merc
    Joined: Dec 19, 2010
    Posts: 734

    42merc
    Member

    Please tell me how the angle of the valves would affect the sealing of the intake.
    The intake surface is flat, tighten the bolts, then check with WD40 for leaks. If no leaks, check compression.
     
    King ford likes this.
  6. adam401
    Joined: Dec 27, 2007
    Posts: 2,287

    adam401
    ALLIANCE MEMBER

    I run an early 2x2 offenhauser on an 8ba with no issue. I run the 59ab style intake gasket. Runs great, pulls hard and idles well. I have a motor minder vacuum guage hooked up and it idles at around 18 vacuum inches.
    Fwiw I also run a pcv valve. Sometimes when people run the early manifold that has no provision for a road draft tube wacky things happen like there is no crankcase ventilation or improper venting. Not sure what you have going on in regards to that.
     
    Bandit Billy likes this.
  7. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 7,060

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    I assume you already checked those wires with an OHM meter for continuity. I had a rough run condition earlier this year on my 8BA and it turned out the number 2 wire ate it's carbon core about an inch or so from the plug end.
     
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  8. Ron Plumlee
    Joined: Feb 12, 2012
    Posts: 130

    Ron Plumlee
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    Ha....my brain is mush after fighting this for several hours over a few days. I still don't see how a leak in the valley is found by WD40 on the exterior. 120 compression on every cyl, wet.
     
  9. Ron Plumlee
    Joined: Feb 12, 2012
    Posts: 130

    Ron Plumlee
    Member

    Yep, have changed wires around, and even new wires, cap, distributor, rotor, etc from different engine. Thanx for input...it is a mystery that will get solved!
     
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  10. Ron Plumlee
    Joined: Feb 12, 2012
    Posts: 130

    Ron Plumlee
    Member

    By golly I shall try a 59AB gasket.....maybe there is a difference? And my ventilation is just at the oil filler cap area on this early manifold.....hmm. Still wonder why just 4 and 8 dead at idle but will try gasket change. Thanx.
     
  11. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 7,060

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    I run a Navarro blower intake and the first time I assembled the upper end I had a vacuum leak. I immediately suspected the gasket, though Mike included it with the intake it did not cover all that well. I used the 59 style gasket as Adam401 did and there has been no issues. I have to admit I am not fond of the look as you see too much of the gasket in my opinion. In hind sight I should have trimmed the gasket for aesthetics sake but running well trumps looking well ( I will deny that if asked :cool:).
    Get that flathead running Ron.
     
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  12. Petejoe
    Joined: Nov 27, 2002
    Posts: 10,664

    Petejoe
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    from Zoar, Ohio

    If you install an early intake on an 8ba you will ruin that engine.
    You will block off the internal ventilation by covering the front vent tube which will trap impurities inside.
    I’ve done this on my 8ba but installed a PCV in it. This will force ventilation through your valve galley and make it happy.
     
    adam401 likes this.
  13. adam401
    Joined: Dec 27, 2007
    Posts: 2,287

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    Yeah I think theres a misunderstanding when people use the early manifold on the later engine that the breather on the oil fill is adequate crankcase ventilation. It is not.
     
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  14. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 7,060

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    Which goes hand in hand on the thread I did a couple months ago on adding a PCV to my intake below the blower. Made an incredible difference.
     
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  15. adam401
    Joined: Dec 27, 2007
    Posts: 2,287

    adam401
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    I'll have to check that out. I did a thread on my pcv install as well
     
  16. Bandit Billy
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  17. adam401
    Joined: Dec 27, 2007
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    adam401
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    Bandit Billy likes this.
  18. Marty Strode
    Joined: Apr 28, 2011
    Posts: 5,334

    Marty Strode
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    I guess I got lucky, running an Edelbrock SU 359 on an 8-BA for 8 years and 13,000 miles. Pulled the engine and put it in another car, with and early Offy intake, been running since, for 15 years. No PCV on either engine, only a breather at the oil fill at the back. It didn't have an easy life, I ran it on dirt ovals, at least 15 outings. Adding PCV sounds like a good idea though. img20161106_16354394.jpg
     
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  19. adam401
    Joined: Dec 27, 2007
    Posts: 2,287

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    Marty I have no idea how that would have been ok but if it worked, it worked. Nice car.
     
  20. Petejoe
    Joined: Nov 27, 2002
    Posts: 10,664

    Petejoe
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    from Zoar, Ohio

    Very lucky.
    Short duration oil changes could help but odds are stacked going against science and engineering.
    PCV is a cheap easy project for peace of mind.
    Great looking car Marty.
     
    Last edited: Nov 4, 2020
  21. Ron Plumlee
    Joined: Feb 12, 2012
    Posts: 130

    Ron Plumlee
    Member

    Is the oil due to ventilation, lack of? I just cut the vent tube off and left it open inside the manifold, hoping maybe that is causing my idle problem at 4 and 8.
     
  22. Ron Plumlee
    Joined: Feb 12, 2012
    Posts: 130

    Ron Plumlee
    Member

    Did you run the early gasket for a particular reason? I did not think enough about ventilation for one thing, and wonder if the early gasket maybe seals better for another....the 8BA looked like a perfect match, maybe not?
     
  23. Ron Plumlee
    Joined: Feb 12, 2012
    Posts: 130

    Ron Plumlee
    Member

    I was kinda forced into the early manifold due to hood clearance, my focus was on getting clearance for carbs plus air cleaners and it all just barely fits....the Eddie Meyer early unit was the lowest profile I could find, but may be a mistake. Hate to cut holes a nice heavily louvered hood!!
     
  24. Ron Plumlee
    Joined: Feb 12, 2012
    Posts: 130

    Ron Plumlee
    Member

    Not yet, gonna have to find a place to tap in, no place to hook in the gauge.
     
  25. dudley32
    Joined: Jan 2, 2008
    Posts: 2,117

    dudley32
    Member

    I learned later from a flathead guy I should have removed (or cut down) the tube in the front of the lifter galley that connects to the road draft tube. This would enable the engine to breath like the 59A did. He said the early intake manifold blocked this tube. Give it a look...
     
  26. Automotive Stud
    Joined: Sep 26, 2004
    Posts: 4,145

    Automotive Stud
    Member

    The 59a had a vent in the oil pan that the 8ba does not, so it would still not vent like a 59a.
     
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