yet another 425 question

Discussion in ''Da Nailhead' started by rg, Oct 30, 2006.

  1. rg

    rg Well-Known Member

    I Have Two Sets Of Exhaust Manifolds,one Set Has A Built In Heat Riser,the Other Dosent. Will It Matter Which Ones I Use On My Neely Rebuilt 66 425??? Thanks Rg
     
  2. awake13

    awake13 Well-Known Member

    That depends... I may be wrong but if you install the right hand on the left it may be upside down or facing the wrong direction.

    The heat riser goes on the right.
     
  3. telriv

    telriv Founders Club Member

    It all of course depends on which body/chassis the engine is going to be installed in.
     
  4. rg

    rg Well-Known Member

    Exhaust

    UPSIDE DOWN,NOW THAT WOULD BE DIFFERENT.NO,I HAVE TWO COMPLEATLY DIFFERENT SETS(TWO RIGHTS,AN TWO LEFTS) BUT EACH SET IS DIFFERENT,ONE SET HAS A BUILT IN HEAT RISER ON ONE OF THE MANIFOLDS THE OTHER SET DOSENT. SHOULD I USE 1.THE SET THAT HAS THE HEAT RISER IN IT OR,2.THE SET THAT DOSENT.THIS IS FOR MY RIVERIA. :Do No:
     
  5. Roberta

    Roberta Buick Berta

    If I had a choose

    I'd use the one without the heat riser, if you're not going to drive when it is cold out, all the heat riser does is help the engine warm up faster, and they tend to rust closed and cut off your exhaust! Not that I know anything about this stuff, since I'm just a girl, LOL!
     
  6. telriv

    telriv Founders Club Member

    Originally all '63-'66 Riviera's, weather 401 or 425 used a separate heat riser valve attached to the right side manifold with a gasket & 2 longer studs.
     
  7. CTX-SLPR

    CTX-SLPR Modern Technology User

    My spring is gone on my and it clatters but is very much free. Even though I drive in the cold I'm planning on deleteing it when I get the TA exhauste for the car. I'm really thinking of converting to an electric choke and eliminating the still present and working heat tubing and choke assembly.
     
  8. rg

    rg Well-Known Member

    only a girl

    only a girl that drives fast cars. i have the upmost respect for all you girls,i mean after all, you have a tough road to drive and when all your drivings done for the day you still have to baby us men.think i will take your advise and leave off heat riser. i just couldnt figure out why i had two and one was with and one was without :Dou:
     
  9. doc

    doc Well-Known Member

    exh. manifolds

    You might try this;
    Go ahead and use the heat riser but cut the short side of the butterfly off leaving the long side.
    this makes the thing sure to open and doesnt alter the exhaust pipe connection on that side.
    But dont block the heat riser passages to the intake manifold. You need some heat to make the fuel vaporize. The nail head intakes are " divorced" from the engine block and run much cooler than the later engines any way.
    On the street nailers run smoother and stronger with heat to the intake.
     
  10. rg

    rg Well-Known Member

    Interesting

    Now That Is Interesting ,i Will Try That. Thank You Very Much.
     
  11. nailheadina67

    nailheadina67 Official Nailheader

    In case you might be interested, I make heatriser deletes specifically for this situation. And they even come with a gasket. :Brow:
     

    Attached Files:

  12. CTX-SLPR

    CTX-SLPR Modern Technology User

    Can you show pictures of how to section the vavle, I'm getting a used one that I'm going to referb when I put on my TA 2.5" kit and I want to keep the vavle but decrease its restriction since the car is largely summer driven though it will see time this winter as a backup to my daily driver when it needs its 120k mile work.
     
  13. doc

    doc Well-Known Member

    heat riser

    Yup, When you take the heat riser valve off and look at it you discover that the flapper valve its self has a long side and a short side. The long side is the trailing edge. The short side is the leading edge. i cut the most of the short side off. Leaving enough so that it still is fastened to the shaft that goes thru it. If you cut too much off then the trailing edge of the flapper has to be welded to the shaft to keep it in. i usually leave about 1/4 "of the leading edge to be sure that it stays on the shaft.
    This also gives the shaft more power to open and less to close.
     
  14. CTX-SLPR

    CTX-SLPR Modern Technology User

    wonderful, thanks for the install advice, sounds perfect for what I want it for.
     
  15. ahhh65riv

    ahhh65riv Well-Known Member

    DIY- heat riser delete

    This is the way I found mine. This is someones idea of a delete. :eek2:
     

    Attached Files:

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