My home inspection of Speedmaster heads

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  1. toolmanmike

    toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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    I would think FP Print-o-seal's would be good. But I don't know for sure.
     
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    • 318willrun

      318willrun Utube channel 318willrun

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      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
       
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      • toolmanmike

        toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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        I have steel shims on my 273 but both surfaces are cast and both have been machined.
         
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        • MOPAROFFICIAL

          MOPAROFFICIAL FABO Gold Member FABO Gold Member

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          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

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          Is the stock to SM head swap planned for soon after the weather breaks?
           
        • 318willrun

          318willrun Utube channel 318willrun

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          I would say yes, although I still toy with the magnum head swap - just to see... LOL
           
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          • aaronk785

            aaronk785 Well-Known Member

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            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.
             
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            • oldkimmer

              oldkimmer FABO Gold Member FABO Gold Member

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              That sucks. Maybe Mike at B3 Racing can fix u up. He sells geometry correction kits. Kim
               
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              • yellow rose

                yellow rose Doctor of Thinkology.

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                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

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                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

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                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.
                 
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                • aaronk785

                  aaronk785 Well-Known Member

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                  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

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                  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 MODERATOR Staff Member FABO Gold Member

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                  Probably so because the oem rockers have a pad instead of a roller.
                   
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                  • aaronk785

                    aaronk785 Well-Known Member

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                    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

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                    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?
                     
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                    • pittsburghracer

                      pittsburghracer FABO Gold Member FABO Gold Member

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                      I haven’t.
                       
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                      • j par

                        j par Well-hung Member

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                        Well get cracking...
                        giphy (4).gif
                         
                      • j par

                        j par Well-hung Member

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                        ^^^^????
                         
                      • pittsburghracer

                        pittsburghracer FABO Gold Member FABO Gold Member

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                        What???
                         
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                        • j par

                          j par Well-hung Member

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                          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...
                           
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                          • j par

                            j par Well-hung Member

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                            Crap! Voice command.. c&c...
                             
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                            • pittsburghracer

                              pittsburghracer FABO Gold Member FABO Gold Member

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                              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.
                               
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                              • j par

                                j par Well-hung Member

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                                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....
                                 
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                                • TurboGLH

                                  TurboGLH Well-Known Member

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                                  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.
                                   
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