Big Block Heat Riser Orientation - NCRS Discussion Boards

Big Block Heat Riser Orientation

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  • John L.
    Very Frequent User
    • December 1, 1997
    • 409
    #1

    Big Block Heat Riser Orientation

    The heat riser on my 1966 427/425 is broken and leaking. The judging manual states that the counterweight should face forward. The assembly manual displays it facing rearward with the counterweight on the engine side. Mine was facing rearward with the counterweight on the fender side however I have not removed it as yet and it may be installed upside down.

    I purchased a new one from LICS. If I face it forward the counter weight would be outboard of the engine on the fender side and the counterwight would move down when the buttterfly opens. Would someone please help with the correct installation and orientation/procedure. I'm confused as usual.

    thanks

    john lolli
    Tags: None
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    • Joe L.
      Beyond Control Poster
      • February 1, 1988
      • 43193
      #2
      Re: Big Block Heat Riser Orientation

      John-----

      Big block heat riser valves have the counterweight oriented on the forward side, with the counterweight "facing" the engine. Small blocks have the counterweight oriented toward the rear of the engine and that may be what you saw in the AIM.
      In Appreciation of John Hinckley
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        • John L.
          Very Frequent User
          • December 1, 1997
          • 409
          #3
          Re: Big Block Heat Riser Orientation

          Joe

          As always thanks for the response.

          I was referencing UPC L72 Sheet C1. It shows the counterweight on the engine side facing rearward.

          john lolli
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            • Joe L.
              Beyond Control Poster
              • February 1, 1988
              • 43193
              #4
              Re: Big Block Heat Riser Orientation

              John-----

              That particular drawing is pretty "sketchy". In any event, it's incorrect.
              In Appreciation of John Hinckley
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                • John L.
                  Very Frequent User
                  • December 1, 1997
                  • 409
                  #5
                  Re: Big Block Heat Riser Orientation

                  Joe

                  Thanks again for the response. If you have a minute would you please take a look at my other recent post regarding a 1966 L-79 Engine - How many fan belts. I also believe there should be two belts. One for the alternator and water pump and another that serves as a redundant belt for the water pump. I beleieve the redundant belt goes on the inside pulley. Please check it out.
                  thanks

                  john lolli
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                    • John Lokay
                      #6
                      Re: Big Block Heat Riser Orientation

                      As was discussed in previous posts, I just wired my heat riser open.
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                        • John L.
                          Very Frequent User
                          • December 1, 1997
                          • 409
                          #7
                          Re: Big Block Heat Riser Orientation

                          John

                          I hear you loud and clear. However besides being broke mine is also leaking.

                          john lolli
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