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Technical Help 350 chevy popping in exhaust

Discussion in 'The Hokey Ass Message Board' started by Archer775, Aug 18, 2014.

  1. Archer775
    Joined: Aug 18, 2014
    Posts: 13

    Archer775

    Ok so I have a el camino with a 350 2 bbl carb HEI dist and I have recently put on new headers and true duals on it and it has a popping from the exhaust. I have messed with the carb a little and the popping didn't really go away it got better but didn't go away
     
    Last edited: Aug 18, 2014
  2. saltflats
    Joined: Aug 14, 2007
    Posts: 10,251

    saltflats
    Member
    from Missouri

    Do you have room to install a balance tube in your exhaust ?
     
  3. I'd bet you have an exhaust leak.
    I'd double down if popping showed up right after your new headers went on.
     
  4. Archer775
    Joined: Aug 18, 2014
    Posts: 13

    Archer775

    Yes I do have room for one
     

  5. Archer775
    Joined: Aug 18, 2014
    Posts: 13

    Archer775

    It doesent sound like it has and leak at all the exhaust leaked really bad before with the original single exhaust
     
  6. Archer775
    Joined: Aug 18, 2014
    Posts: 13

    Archer775

    Oh I'm sorry enlighten me on the rules where can I find the rules at p.s. I'm 16 and don't have a mullet
     
  7. tfeverfred
    Joined: Nov 11, 2006
    Posts: 15,793

    tfeverfred
    Member

    TRADIONAL (PRE 1965) HOT RODS AND CUSTOMS. We live in the past here. Ryan's time machine had only one setting and we all hopped in. Johnsons in the White House and our boys are fighting on foreign soil. The Mustang looks okay, but we're holding out. The Beatle's are good, but we won't admit it. The Beaach Boys ROCK. CUT YOUR HAIR!
     
    Hill_County-rodshop and hrm2k like this.
  8. big duece
    Joined: Jul 28, 2008
    Posts: 5,986

    big duece
    Member
    from kansas

    I think he meant 1965, with a 350 that was put in later. Go with it Archer... let's slide some slack, at least its not an blazer 4x4 chassis conversion, or is it??
     
  9. Archer775
    Joined: Aug 18, 2014
    Posts: 13

    Archer775

    Ok so if it didn't pop before with stock exhaust how could valve springs be a problem
     
  10. Archer775
    Joined: Aug 18, 2014
    Posts: 13

    Archer775

    No it seams to have as much power as it should
     
  11. alphabet soup
    Joined: Jan 8, 2011
    Posts: 1,410

    alphabet soup
    ALLIANCE MEMBER

    Make sure you don't have plug wires 5 and 7 crossed.
     
  12. Archer775
    Joined: Aug 18, 2014
    Posts: 13

    Archer775

    But I guess I didn't get as much increased performance as I hoped for
     
  13. Archer775
    Joined: Aug 18, 2014
    Posts: 13

    Archer775

    I'll try the spark plug wires because i did have to remove all wires and plugs to get the headers in
     
  14. tooljunkie
    Joined: Oct 18, 2010
    Posts: 209

    tooljunkie
    Member
    from manitoba

    my money is on the wires..18436572. but we all know that.
    i prefer to start with rotor pointing at #1 cylinder,tdc.
    good luck
     
  15. El KaMiNo KiD
    Joined: Jun 15, 2009
    Posts: 509

    El KaMiNo KiD
    Member

    Maybe a loose plug...
     
  16. models916
    Joined: Apr 19, 2012
    Posts: 380

    models916
    Member

    Vacuum hose off somewhere!
     
  17. .. lest us not forget the Marlboro cigarette jacket and HD sticker on the back window.
     
  18. Russco
    Joined: Nov 27, 2005
    Posts: 4,132

    Russco
    Member
    from Central IL

    Is it popping when you let off of the gas ( deceleration) ? If so like Vicky stated I'm betting its an exhaust leak.
     
  19. Are you using Champion Spark plugs? HRP
     
  20. Archer775
    Joined: Aug 18, 2014
    Posts: 13

    Archer775

    I'm using standard AC delco plugs and yes it mostly back fireds when you let off the gas but it also does it some times when your sill in the gas
     
  21. Lots of things to look at, as 31Vicky said exhaust leak, also the 5 and 7 plug wire crossed is something to watch for, I have been at this nearly 45 years and still cross them on occasion. Look for a loose wire in your ignition circuit as well, maybe coming off the switch or where is connects to the distributer, a momentary laps in zot to the dizzy will cause a back fire.

    I don't care if you need a hair cut or not by the way, be yourself first and let the chips fall where they may.
     
  22. Archer775
    Joined: Aug 18, 2014
    Posts: 13

    Archer775

    Could the carb be off? Sounds to me like maybe it's not getting enough gas
     
  23. Archer775
    Joined: Aug 18, 2014
    Posts: 13

    Archer775

    5 and 7 wires are correct
     
  24. It sounds to me that you need to richen the fuel mix to compensate for the more efficient exhaust system (lean mis fire some call that). You might also advance the timing a hair and see what that does just for kicks
     
    Hill_County-rodshop likes this.
  25. Archer775
    Joined: Aug 18, 2014
    Posts: 13

    Archer775

    That's exactly what I thought
     
  26. Let us know what you find out. Part of the reason we all help is to learn. That's hard to do when the person doesn't report back just "what" fixed the problem.
     
    NOPSI and Russco like this.
  27. Archer775
    Joined: Aug 18, 2014
    Posts: 13

    Archer775

    I fixed it the carb was way way lean now it doesn't back fire hardly at all :).
     
    NOPSI and Groucho like this.
  28. COOL! THX
     

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