Speedmaster Small block porting tips and results

Mopar Racers Forum

  1. Cudafever

    Cudafever Well-Known Member

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    The last intake on my experimental head is going to get a 50degree seat. If you have a pressure issue in the combustion chamber. And I think these SM will have, as they grow in cfm. You have to sink the valve or cut the seat to50 to make the air happy. Maybe not. We will just half to see how PBR proceeds with his plans
     
  2. gzig5

    gzig5 Well-Known Member

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    I don't know if I'm behind the curve, but did we get flow numbers after opening up the chamber around the valves and after tubing and removing the push-rod pinch?
     
  3. Cudafever

    Cudafever Well-Known Member

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    I haven’t seen any intake numbers
     
  4. pittsburghracer

    pittsburghracer FABO Gold Member FABO Gold Member

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    I had my bench set up to flow the exhaust side so while it was in that mode I ported the exhaust. Intake numbers coming soon.
     
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    • MOPAROFFICIAL

      MOPAROFFICIAL FABO Gold Member FABO Gold Member

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      Low lift flow isnt everything just as much as high lift flow isnt everything. It's all important. Getting the most air you can in with the window of lift and time you cam for is the object. Which brings us back to not everything is max effort, hence why the higher low lift compensates for the lack of cam/rpm.
      I don't think he needs a 50° seat to get the numbers he's looking for. That's all I have to say about it till you dig out your econo heads and test those seat angles out on'em and report back with stellar results...then maybe I'll go back to work on those j's and see if 290cfm decides to rear its head in the other 7cyl. One port is special sometimes...strangest thing.
       
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      • yellow rose

        yellow rose Doctor of Thinkology.

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        LOL. Yep. One port can be golden and you can't get the rest happy. Core shift, internal materiel loss...who knows.

        I'm hoping by spring I can get some time on the flow bench. I may not publically post everything I find, but I may PM the results.

        Some things don't need to be public, but I'd share with members of this forum privately for sure.
         
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        • Cudafever

          Cudafever Well-Known Member

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          In my hotel room
          On vacation.
          Waiting for room survive.
          Chop chop!
          ...............yah I’m board.
           
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          • Cudafever

            Cudafever Well-Known Member

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            ....
            So I guess the icons/emojis on my tablet are not approved.:soapbox::wtf::bs_flag:
            Oil Well. I got a kick out of it,, but u all won’t.."......
            “..
            )
             
            Last edited: Jan 7, 2020
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            • pittsburghracer

              pittsburghracer FABO Gold Member FABO Gold Member

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              I did lower the shortside a little Sunday (.080) and it responded with 4-5cfm max so we are in the low 280’s at .700 with more on the table.
               
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              • oldkimmer

                oldkimmer FABO Gold Member FABO Gold Member

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                Great. Kim
                 
              • Cudafever

                Cudafever Well-Known Member

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                Your going to make me eat my words.......

                :popcorn:
                 
              • 318willrun

                318willrun Utube channel 318willrun

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                just curious, what anti-freeze do you all plan on running through your aluminum heads?????? Street or street/strip guys (I know, full time race cars will have something different).
                 
              • toolmanmike

                toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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                Most drag strips require water. Car manufacturers use propylene glycol in their aluminum engines. A combination cast and alloy headed engine should be good with Ethylene glycol.
                 
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                • 318willrun

                  318willrun Utube channel 318willrun

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                  Thanks, i agree on the choices. I've never had anyone ask what I had for coolant. 30 yrs of going to the strip.... Always look for the overflow, though. I think they just know a street car will have a 50/50 blend.
                   
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                  • toolmanmike

                    toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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                    Yes, street cars must have a overflow. a hose and a plastic pop bottle atached with a tie strap does the trick. (depending on how anal the tech guy is) LOL
                     
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                    • 318willrun

                      318willrun Utube channel 318willrun

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                      Honestly, unless there is somebody new, they don't even look at my cars. In fact, tech was closed the last time I got there a little late and I just went to the tower and they said "you've been here before, you know" and took my card. In 30+ years, I've never put fluid on their track, nor delayed their race. But then, many of the old workers that knew me don't work there anymore.
                       
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                      • Cudafever

                        Cudafever Well-Known Member

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                        Man.you had better find some wood to knock on:poke::D
                         
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                        • MOPAROFFICIAL

                          MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                          No glass fuel filters either. If they're in a good mood though they will duct tape around it and let you run.
                           
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                          • toolmanmike

                            toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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                            Haven't seen one of those since our old 55 International pick up. LOL
                             
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                            • j par

                              j par Well-hung Member

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                              I've always just ran distilled water and a bottle of Redline water wetter...
                               
                            • rumblefish360

                              rumblefish360 So close, yet so far away FABO Gold Member

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                              What he said ^^^^^^ at the track, on the street, I take the lazy way out and purchase the 50/50 blend. It’s just easier then getting 100% antifreeze and the getting the distilled water separate.
                               
                            • fishmens67

                              fishmens67 Well-Known Member

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                              Evans waterless
                               
                            • pittsburghracer

                              pittsburghracer FABO Gold Member FABO Gold Member

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                              Johns tap water
                               
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                              • yellow rose

                                yellow rose Doctor of Thinkology.

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                                LOL you cheap screw!!!!
                                 
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                                • yellow rose

                                  yellow rose Doctor of Thinkology.

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                                  That's what I use. I'll never go back to anything else. And the track can kiss my ass. They start paying my engine bills and THEN they can tell me what to use for coolant.
                                   
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