1. muscle72

    muscle72 Well-Known Member

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    Is a 850 speed demon good for a big block either a 383 or 440 with a 292 high extreme energy comp cam. Is the 850 to much carb? would a 750 speed demon be better?
     
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    • Aron Gleason

      Aron Gleason Well-Known Member

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      I would get a hold of Dominic thumper on Facebook. He's the go to carburetor guy. He's well known for how good his carburetors perform.
       
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      • beanhead

        beanhead Well-Known Member

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        Use the shiny one.
         
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        • muscle72

          muscle72 Well-Known Member

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          The shiny one? Not talkin about the one that's my profile pic.talkin about another l have
           
          Last edited: Sep 15, 2021 at 12:05 AM
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          • beanhead

            beanhead Well-Known Member

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            What type of driving are you building for? Compression, heads/flow, intake, exhaust and engine size kinda need to be known for a real recommendation..
             
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            • muscle72

              muscle72 Well-Known Member

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              Probably stock 906 heads with bigger intake and exhaust valves.either a 383 the cam is goin in or another 440 close to 10:1 compression or stock compression a 68 383 hp makes
               
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              • vintage chromoly

                vintage chromoly Well-Known Member

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                An 850 is fine for a warmed up 440.
                 
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                • BSB67

                  BSB67 Well-Known Member

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                  Hard to pick a carb when you dont know the motor it is going on.
                   
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                  • blue69runner

                    blue69runner Well-Known Member

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                    650-700 cfm four barrel Holley is fine on a 383. 9.8 to 1 is what I am running. Plenty of pep. Running 80 jet's in it now it had 74 jetting on primary and 80 jetting metering plate. Changed to 80 jet's on primary and it work's fine now. Just my two cent's.
                     
                  • RJRENTON

                    RJRENTON FBBO Gold Member FBBO Gold Member

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                    Who is "Dominic thumper" and what are his credentials. I'm a "carb guy" as well and I'm sure he's not heard of me either and I'm not on Facebook. Is he a self proclaimed expert too? Just curious....perhaps we can exchange some tuning "secrets".
                    BOB RENTON
                     
                  • Aron Gleason

                    Aron Gleason Well-Known Member

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                    He doesn't claim to know everything, but he's well known. He's working with Shane Studley at precision cylinder head.
                     
                  • Aron Gleason

                    Aron Gleason Well-Known Member

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                    If you want to you can give him a call. 760-900-3895
                     
                  • moparedtn

                    moparedtn Ed on the Ridge FBBO Gold Member

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