My home inspection of Speedmaster heads

Mopar Racers Forum

  1. pittsburghracer

    pittsburghracer Well-Known Member

    Messages:
    2,698
    Likes Received:
    4955
    Joined:
    Apr 20, 2016
    Location:
    Freeport, PA.
    Local Time:
    2:11 PM
    Come on guys. Johnny made a funny.
     
    • Like Like x 2
    • j par

      j par Well-hung Member

      Messages:
      21,014
      Likes Received:
      10301
      Joined:
      Jul 2, 2014
      Location:
      Portland Oregon
      Local Time:
      11:11 AM
      Toke.gif Toke.gif Toke.gif Toke.gif Toke.gif Toke.gif
       
    • Cudafever

      Cudafever Well-Known Member

      Messages:
      3,664
      Likes Received:
      1140
      Joined:
      Sep 27, 2009
      Local Time:
      12:11 PM
      so are you going to build a similar eng for That Eddy head
      I'm hoping so but we usually learn and build up on each new eng...........................................
       
    • pittsburghracer

      pittsburghracer Well-Known Member

      Messages:
      2,698
      Likes Received:
      4955
      Joined:
      Apr 20, 2016
      Location:
      Freeport, PA.
      Local Time:
      2:11 PM
      That engine was rebuilt 3 times and in need of its fourth when it ran 9.70’s. My son borrowed it and it ran 10.0’s@3200 pounds with a 727 and 4.10 gears. Next one with have more cam, way more compression, and hopefully a set of Edelbrock heads with the rocker moved over .350.
       
      • Like Like x 1
      • Thanks! Thanks! x 1
      • Cudafever

        Cudafever Well-Known Member

        Messages:
        3,664
        Likes Received:
        1140
        Joined:
        Sep 27, 2009
        Local Time:
        12:11 PM
        So you feel the greatest restriction, the way they are ported now, is the PRP?(Your 9.70 eddy heads)
         
      • pittsburghracer

        pittsburghracer Well-Known Member

        Messages:
        2,698
        Likes Received:
        4955
        Joined:
        Apr 20, 2016
        Location:
        Freeport, PA.
        Local Time:
        2:11 PM

        No not at all because I Flow tested it after I opened it up .250-300 and only picked up a few cfm. It’s going to let me try a few things on that wall that I couldn’t do before. Fingers crossed type of deal. Goodnight all and Happy New Year.
         
        • Like Like x 4
        • Thanks! Thanks! x 1
        • TurboGLH

          TurboGLH Well-Known Member

          Messages:
          202
          Likes Received:
          222
          Joined:
          Jul 29, 2017
          Location:
          CT
          Local Time:
          2:11 PM
        • yellow rose

          yellow rose Doctor of Thinkology.

          Messages:
          20,409
          Likes Received:
          16494
          Joined:
          Jun 19, 2015
          Location:
          Living on the razors edge
          Local Time:
          11:11 AM
          • Like Like x 1
          • toolmanmike

            toolmanmike FABO Staff Staff Member FABO Gold Member

            Messages:
            46,816
            Likes Received:
            31072
            Joined:
            Jan 18, 2006
            Location:
            Iowa
            Local Time:
            1:11 PM
            5 or 6 threads?
             
          • toolmanmike

            toolmanmike FABO Staff Staff Member FABO Gold Member

            Messages:
            46,816
            Likes Received:
            31072
            Joined:
            Jan 18, 2006
            Location:
            Iowa
            Local Time:
            1:11 PM
            According to 318's photo, the thread end of the plugs terminate very close to the short side of the threads. I think cleaning the exposed thread area is the way to go. The angle of the plug is the cause of the issue.

            plug.JPG
             
            • Agree Agree x 1
            • TurboGLH

              TurboGLH Well-Known Member

              Messages:
              202
              Likes Received:
              222
              Joined:
              Jul 29, 2017
              Location:
              CT
              Local Time:
              2:11 PM
              Yeah, the jump in lengths are .460, .750 and 1.04. My heads arent here or I'd try one and post pics. I'm not worried about the issue, but since it's a topic as much info as possible is always best.
               
            • 12many

              12many Well-Known Member

              Messages:
              1,079
              Likes Received:
              1313
              Joined:
              Dec 14, 2016
              Location:
              SC
              Local Time:
              1:11 PM
              If you did find a longer plug the shell threads are going to then protrude on the short side. You want all of the shell making full contact with the head.
               
            • yellow rose

              yellow rose Doctor of Thinkology.

              Messages:
              20,409
              Likes Received:
              16494
              Joined:
              Jun 19, 2015
              Location:
              Living on the razors edge
              Local Time:
              11:11 AM


              From the picture in 610 the plug needs to be about .060 deeper at the most.

              You are correct that you sone want any part of the shell in the chamber. The face of the shell should be flush with the chamber.
               
            • 12many

              12many Well-Known Member

              Messages:
              1,079
              Likes Received:
              1313
              Joined:
              Dec 14, 2016
              Location:
              SC
              Local Time:
              1:11 PM
              So ideally, machine the bores to depths needed and then index the plugs so the strap is close to long side, about as perfect as you’d get things. Maybe a new procedure for you machinists out there, make a fortune!
               
            • gzig5

              gzig5 Well-Known Member

              Messages:
              1,015
              Likes Received:
              960
              Joined:
              May 3, 2018
              Location:
              Mequon, WI
              Local Time:
              1:11 PM
              I'm already looking at what I need for a fixture to make up for the angle on the mill table. Might not have enough daylight under the head. That's where piloted tooling and using the tilting table on the drill press may work. Not as rigid but the pilot should make up for most of that. Get a set of shims would allow you to index each plug in certain increments to optimize it's presentation to the chamber? Got to be worth 1/2hp per cylinder at least, don't you think? I really do think the depth and indexing would be beneficial but I don't think you would begin to see measurable results unless you had a marginal combination, or are running a max effort motor.

              I don't think a fortune is to be made here. Might be able to get $50 a head plus shims? Most of you guys are frugal. :poke: I did not say cheap. I'm very careful where I spend my fun money too. :lol:
               
              • Like Like x 2
              • yellow rose

                yellow rose Doctor of Thinkology.

                Messages:
                20,409
                Likes Received:
                16494
                Joined:
                Jun 19, 2015
                Location:
                Living on the razors edge
                Local Time:
                11:11 AM

                Yep. As for the making a fortune part...HAAAAAAAAAA HAAAAAAAAAAA you'd have to convince people it's worth the effort and those folks are few and far between, and most of them can do their own machine work.

                I'm a details guy. It's the little things that add up. Anyone can do the easy stuff. I'd bet money, big money, like all I have and some stuff I don't, that guys like PBR and PRH and a few others...MoparOfficial...probably missing some names here but you get who I'm talking about all do the very same thing every time they check out someone's port work...they get a finger in the port and check the short turns.

                I know I do it. First, very first place I go to, because it's the hardest place to grind and get it correct. And most guys just buff it off and let it go, which isn't a bad thing in many cases. You can loose more there in a second or two than most would recognize.

                Before I bought my flow bench I had several other shops with them test my stuff for me and it was hilarious. First thing was a finger up my short turns. Then they look at the valve job.

                That's why PBR and his thread is so interesting. I can sit back, read his stuff and enjoy what he's doing. He is explaining it much better than I can. And those who want to learn, if for no other reason than to be better informed when looking at cylinder heads.

                The guys who want to improve their heads can really learn a bunch from his work.
                 
                • Agree Agree x 2
                • yellow rose

                  yellow rose Doctor of Thinkology.

                  Messages:
                  20,409
                  Likes Received:
                  16494
                  Joined:
                  Jun 19, 2015
                  Location:
                  Living on the razors edge
                  Local Time:
                  11:11 AM

                  Once you know how much you need to take out of the hole, you shouldn't need many indexing washers. Not any more than you would if you were just indexing the plugs.

                  Go for it.
                   
                • 12many

                  12many Well-Known Member

                  Messages:
                  1,079
                  Likes Received:
                  1313
                  Joined:
                  Dec 14, 2016
                  Location:
                  SC
                  Local Time:
                  1:11 PM
                  Learning how to finger a port.....that like getting to first base or second? I can’t remember!
                   
                  • Like Like x 2
                  • toolmanmike

                    toolmanmike FABO Staff Staff Member FABO Gold Member

                    Messages:
                    46,816
                    Likes Received:
                    31072
                    Joined:
                    Jan 18, 2006
                    Location:
                    Iowa
                    Local Time:
                    1:11 PM
                    I knew a gal that was like a LS port.....never mind! :rofl:
                     
                  • 12many

                    12many Well-Known Member

                    Messages:
                    1,079
                    Likes Received:
                    1313
                    Joined:
                    Dec 14, 2016
                    Location:
                    SC
                    Local Time:
                    1:11 PM
                    There’s a short side radius aka “G” spot joke somewhere here!
                     
                    • Agree Agree x 1
                    • toolmanmike

                      toolmanmike FABO Staff Staff Member FABO Gold Member

                      Messages:
                      46,816
                      Likes Received:
                      31072
                      Joined:
                      Jan 18, 2006
                      Location:
                      Iowa
                      Local Time:
                      1:11 PM
                      :rofl::rofl: Sorry to sidetrack but that is funny right there!
                       
                      • Agree Agree x 1
                      • Cudafever

                        Cudafever Well-Known Member

                        Messages:
                        3,664
                        Likes Received:
                        1140
                        Joined:
                        Sep 27, 2009
                        Local Time:
                        12:11 PM
                        If your good enuf it a home run:lol:
                         
                        • Like Like x 1
                        • gzig5

                          gzig5 Well-Known Member

                          Messages:
                          1,015
                          Likes Received:
                          960
                          Joined:
                          May 3, 2018
                          Location:
                          Mequon, WI
                          Local Time:
                          1:11 PM
                          I thought that would equate to a triple, but it's been a long time since I played that sport.
                           
                          • Agree Agree x 1
                          • 12many

                            12many Well-Known Member

                            Messages:
                            1,079
                            Likes Received:
                            1313
                            Joined:
                            Dec 14, 2016
                            Location:
                            SC
                            Local Time:
                            1:11 PM
                            I got the perfect short side radius (or what have you:eek:) middle finger. Result of a dirt bike wipeout years ago. Nice curvature at rest no?

                            3F41ECCF-5D45-4964-B005-F632E213752D.jpeg
                             
                            • Agree Agree x 3
                            • Like Like x 1
                            • 318willrun

                              318willrun Roadkill '80 D150

                              Messages:
                              13,502
                              Likes Received:
                              13655
                              Joined:
                              Sep 13, 2013
                              Location:
                              I'm here
                              Local Time:
                              1:11 PM
                              Pulled the 2nd head apart today. Valves all held alcohol. Valve guides were the same as the first head meaning ok to use in my opinion. I'll remove the same burrs under the seat with the Dremel buffer. The spark plug holes are already done. About 1.5 hrs to complete this head meaning both my small block SM heads will be ready to bolt and go.
                               
                              Last edited: Jan 7, 2020
                              • Like Like x 3
                              1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                                By continuing to use this site, you are consenting to our use of cookies.