My home inspection of Speedmaster heads

Mopar Racers Forum

  1. toolmanmike

    toolmanmike FABO Staff Staff Member FABO Gold Member

    Messages:
    46,811
    Likes Received:
    31070
    Joined:
    Jan 18, 2006
    Location:
    Iowa
    Local Time:
    11:38 AM
    I would think FP Print-o-seal's would be good. But I don't know for sure.
     
    • 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:
      11:38 AM
      I've always just ran the "over the counter" felpro's. Never had an issue. I thought the SM's for 7 bucks on 40% off was a good deal. But it was 7 dollars too much!!!! LOL
       
      • Agree Agree x 2
      • Like Like x 1
      • toolmanmike

        toolmanmike FABO Staff Staff Member FABO Gold Member

        Messages:
        46,811
        Likes Received:
        31070
        Joined:
        Jan 18, 2006
        Location:
        Iowa
        Local Time:
        11:38 AM
        I have steel shims on my 273 but both surfaces are cast and both have been machined.
         
        • Like Like x 1
        • MOPAROFFICIAL

          MOPAROFFICIAL Well-Known Member

          Messages:
          5,015
          Likes Received:
          3995
          Joined:
          Jun 1, 2016
          Location:
          Beach
          Local Time:
          9:38 AM
          Looks like DIY stick downs to me.
          Most will break when they land dead nuts on the end, more like crease and become a hinge flopping back and forth till it falls off.
          Drop a 1213.

          Blue ones dont have that issue
           
        • PRH

          PRH Well-Known Member

          Messages:
          1,599
          Likes Received:
          2368
          Joined:
          Dec 14, 2018
          Location:
          So. Burlington, Vt
          Local Time:
          12:38 PM
          Is the stock to SM head swap planned for soon after the weather breaks?
           
        • 318willrun

          318willrun Roadkill '80 D150

          Messages:
          13,502
          Likes Received:
          13655
          Joined:
          Sep 13, 2013
          Location:
          I'm here
          Local Time:
          11:38 AM
          I would say yes, although I still toy with the magnum head swap - just to see... LOL
           
          • Like Like x 1
          • aaronk785

            aaronk785 Well-Known Member

            Messages:
            502
            Likes Received:
            326
            Joined:
            Apr 21, 2013
            Location:
            westmoreland ks.
            Local Time:
            11:38 AM
            Just got done assembly my sm heads after porting and valve job with backcut valves. Set the shafts in the saddles to check some geometry. Not a good fit at all. Seems they were machined for a .950 shaft. So now I have to make some special shims to make them work. I missed it. Live and learn.
             
            • Like Like x 1
            • oldkimmer

              oldkimmer FABO Gold Member FABO Gold Member

              Messages:
              14,009
              Likes Received:
              3447
              Joined:
              Nov 11, 2006
              Location:
              Kindersley, Saskatchewan,
              Local Time:
              11:38 AM
              That sucks. Maybe Mike at B3 Racing can fix u up. He sells geometry correction kits. Kim
               
              • 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:
                9:38 AM

                How close is the geometry? If it needs to be corrected you can get ahold of Mike at B3 and tell him what you have and maybe he can make you shims to correct the big saddles.

                I must say, I've never heard of any shafts that big so I'm stumped.
                 
              • aaronk785

                aaronk785 Well-Known Member

                Messages:
                502
                Likes Received:
                326
                Joined:
                Apr 21, 2013
                Location:
                westmoreland ks.
                Local Time:
                11:38 AM
                I'm no geometry expert but it seems pretty close. Using 273 adj. rockers they sweep from one side to the other and close to center at mid lift. Sweep is close to centered on the valve. Is this right? Sweep is almost the full width of the valve.
                 
              • fishmens67

                fishmens67 Well-Known Member

                Messages:
                7,026
                Likes Received:
                4205
                Joined:
                Nov 10, 2012
                Location:
                idaho
                Local Time:
                11:38 AM
                The sweep should be centered and about .030" wide .
                Sweep of full width of the valve is not good.
                You really want it centered and to reverse direction throughout the lift cycle.
                 
                • Agree Agree x 2
                • Thanks! Thanks! x 1
                • aaronk785

                  aaronk785 Well-Known Member

                  Messages:
                  502
                  Likes Received:
                  326
                  Joined:
                  Apr 21, 2013
                  Location:
                  westmoreland ks.
                  Local Time:
                  11:38 AM
                  I knew that was the case with a roller rocker. I thought a iron rocker was different. I must be way off.
                   
                • aaronk785

                  aaronk785 Well-Known Member

                  Messages:
                  502
                  Likes Received:
                  326
                  Joined:
                  Apr 21, 2013
                  Location:
                  westmoreland ks.
                  Local Time:
                  11:38 AM
                  Every stock or iron rocker I've seen had wear mark atleast the width of the valve. Looks like the rocker actually rolls over the valve and don't scrub much.
                   
                • toolmanmike

                  toolmanmike FABO Staff Staff Member FABO Gold Member

                  Messages:
                  46,811
                  Likes Received:
                  31070
                  Joined:
                  Jan 18, 2006
                  Location:
                  Iowa
                  Local Time:
                  11:38 AM
                  Probably so because the oem rockers have a pad instead of a roller.
                   
                  • Agree Agree x 1
                  • aaronk785

                    aaronk785 Well-Known Member

                    Messages:
                    502
                    Likes Received:
                    326
                    Joined:
                    Apr 21, 2013
                    Location:
                    westmoreland ks.
                    Local Time:
                    11:38 AM
                    Installed a .040 non tapered shim. Made the shaft fit the saddle perfect and helped geometry some also. .870 + .080 = .950.
                     
                  • TurboGLH

                    TurboGLH Well-Known Member

                    Messages:
                    202
                    Likes Received:
                    222
                    Joined:
                    Jul 29, 2017
                    Location:
                    CT
                    Local Time:
                    12:38 PM
                    I was sitting here feeling pleased with myself for finding a piston that gave me what I wanted for DCR and allowed me to run a thin enough gasket to get good quench clearance, and I realized that I had done all my math on the supposed 68cc chamber sized.

                    Unfortunately, I'd feel better if SM didn't give two different chamber sizes, 65 and 68cc, depending on if you got CNC porting or not, but they only do chamber work on the bare cnc heads, the assembled ones have as cast. Worse, the edelbrocks they're based on are supposed to be 63cc.

                    Here's the question...Has anyone CC'd the chambers on any of the SM heads?
                     
                    • Like Like x 1
                    • pittsburghracer

                      pittsburghracer Well-Known Member

                      Messages:
                      2,698
                      Likes Received:
                      4952
                      Joined:
                      Apr 20, 2016
                      Location:
                      Freeport, PA.
                      Local Time:
                      12:38 PM
                      I haven’t.
                       
                      • Like Like x 2
                      • j par

                        j par Well-hung Member

                        Messages:
                        21,012
                        Likes Received:
                        10299
                        Joined:
                        Jul 2, 2014
                        Location:
                        Portland Oregon
                        Local Time:
                        9:38 AM
                        Well get cracking...
                        giphy (4).gif
                         
                      • j par

                        j par Well-hung Member

                        Messages:
                        21,012
                        Likes Received:
                        10299
                        Joined:
                        Jul 2, 2014
                        Location:
                        Portland Oregon
                        Local Time:
                        9:38 AM
                        ^^^^????
                         
                      • pittsburghracer

                        pittsburghracer Well-Known Member

                        Messages:
                        2,698
                        Likes Received:
                        4952
                        Joined:
                        Apr 20, 2016
                        Location:
                        Freeport, PA.
                        Local Time:
                        12:38 PM

                        What???
                         
                        • Thanks! Thanks! x 1
                        • j par

                          j par Well-hung Member

                          Messages:
                          21,012
                          Likes Received:
                          10299
                          Joined:
                          Jul 2, 2014
                          Location:
                          Portland Oregon
                          Local Time:
                          9:38 AM
                          We all know that you got all the stuff to see see one of those heads for us...
                          I'm sure you could do it blindfolded....
                          If you're looking for a pretty please with sugar on top I can give you that...
                           
                          • Like Like x 1
                          • Agree Agree x 1
                          • j par

                            j par Well-hung Member

                            Messages:
                            21,012
                            Likes Received:
                            10299
                            Joined:
                            Jul 2, 2014
                            Location:
                            Portland Oregon
                            Local Time:
                            9:38 AM
                            Crap! Voice command.. c&c...
                             
                            • Like Like x 1
                            • pittsburghracer

                              pittsburghracer Well-Known Member

                              Messages:
                              2,698
                              Likes Received:
                              4952
                              Joined:
                              Apr 20, 2016
                              Location:
                              Freeport, PA.
                              Local Time:
                              12:38 PM
                              Ohhh damn I’ll add another job to the list. I’m taking it you need a stock non cnc’d Speedmaster Head chamber cc.
                               
                              • Like Like x 1
                              • j par

                                j par Well-hung Member

                                Messages:
                                21,012
                                Likes Received:
                                10299
                                Joined:
                                Jul 2, 2014
                                Location:
                                Portland Oregon
                                Local Time:
                                9:38 AM
                                Yes.. ^^^ up there in posts 691 also it was @TurboGLH that brought up the subject.. we can't trust any information Speedmaster gives us, we've learned that so far....
                                 
                                • Like Like x 1
                                • TurboGLH

                                  TurboGLH Well-Known Member

                                  Messages:
                                  202
                                  Likes Received:
                                  222
                                  Joined:
                                  Jul 29, 2017
                                  Location:
                                  CT
                                  Local Time:
                                  12:38 PM
                                  I don't have access to a good setup at work anymore, so I'm in the process of piecing one together right now. I know SM claims a difference in the two, as cast vs CNC, but the CNC work is ports only on my heads, so they should really be the same.

                                  If you succumb to the arm twisting before I get a chance, great, if not I plan to post up numbers as soon as I can.
                                   
                                  • Thanks! Thanks! x 2
                                  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.