Small block 426 stroker with trickflow heads. How much HP.

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  1. flyfish

    flyfish C8H18+N2O = :-D

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    Depending on the exhaust/mufflers, that may not hurt it much. My car runs almost the exact same number with or without my 3" exhaust. My exhaust exits before the rear tire with Dynomax race bullets for mufflers if that helps.
     
  2. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    More than a Briggs and Stratton and less than a container ship engine.
     
  3. 1965fish

    1965fish Well-Known Member

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    I run little bit more of a muffler. Dynomax Ultra Flo offset 3" that dumps in front of the rear housing. Also have a Pypes 3" X pipe. I have never made a run with open headers so I dont know if there is a difference or not.
    Hopefully will find out soon what it will run.
     
  4. PRH

    PRH Well-Known Member

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    I’ve never tried building a 650hp SBM, but it seems like attempting it with heads that have a std port opening and a std pushrod pinch, along with small tube headers is asking for a lot out of those parts.
     
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    • mopar65

      mopar65 Well-Known Member

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      I havent either. But I figured you or some body on here had. I am stuck with the 1-5/8 headers for now because thst is the biggest comp makes them for a first gen dakota. Now I found a place that makes 1-3/4 and 1-7/8 for a 97 and up dakota. But don't really want to spend a 1000 on headers not knowing if they would fit my 96. Also I wasn't sure if the trickflows would flow enough for the hp I am looking for. I think I read some wear that the gen3 hemi eagle heads I have flow over 320 cfm stock. I might just have to give up on the magnum stroker build and start buying more gen 3 hemi parts. Lol
       
    • rumblefish360

      rumblefish360 So close, yet so far away FABO Gold Member

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      Man! I hear ya there!
      The general layman’s rule of 2hp per 1cfm flow is good only so far. As PRH said......

      It is kind of like.... the flow rate of 300cfm through the TF port we will change to 300 people through a highly developed ergonomically contoured door. So many people can get through the door.
      300 people single file through the door per minute.

      Now if we open the door to a 2 person door wide door that still moves 300 people per minute, more people get in.
      W2-5, Indy, Victor, etc

      If you had a big block, the door is triple wide.....
      3 people wide at 300 people per minute.....
       
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      • IQ52

        IQ52 Well-Known Member

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        I don't know if any of this will help but we did a thread years back on a 423.5 ci 360 that for fun we called it a 426. It was 10.9:1 compression and we started with Speed Master heads, threw them away, and went with LAX iron heads. Used 1-5/8 headers for awhile and then TTI step headers. Ran an Edelbrock Super Victor intake and a solid roller cam of 258/260 @ .050", .425/.430 lobe lift and eventually 1.6 rockers. Finally went over 620 HP. Should give you a rough idea of what you may get with your engine.

        Is 426ci 360 a small block?
         
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        • famous bob

          famous bob mopar misfit

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          I had a hot 406 vega , w/ dumped 3'' flowmasters , .003 diff. w/out , think it was mostly just the weight diff. !
          The drone was terrible .
          IMG_0235 (1).jpg I have 3 1/2'' dumped on my 440/505 now , w/ home built mufflers , no drone -----------
           
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          • B3422w5

            B3422w5 Well-Known Member

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            650 isnt easy to hit. Takes good flowing heads, stout camshaft, good combination of parts.
            If a car isn't running 135 mph at 3300 pounds, it isn't making 650. If less weight than that, more mph.
             
          • o1heavy

            o1heavy 1974 dart sport

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            3rd gen hemi!!!
             
          • yellow rose

            yellow rose Overnight Sensation FABO Gold Member

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            I’ve done that and more, but it’s not cheap or easy. As I’ve posted before, I certainly did it the hard way, but either way you try and get anywhere near 2 HP/CID it’s going to cost big bucks no matter what name is on the valve cover.
             
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            • mopar65

              mopar65 Well-Known Member

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              Who's kit did you use?
               
            • 1965fish

              1965fish Well-Known Member

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              I used the Hughes kit with flat top pistons.
              Did not use the rings from their kit though.
              Went with Total seal gapless instead.
              Just came in from taking it for a little street cruise.
              Man, I cant wait to get this thing to the track. It feels pretty good.
               
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              • mopar65

                mopar65 Well-Known Member

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                Cool. Its looking more like I am going to buy the flat top kit also. What size cam are you running? So you didn't like the rings that come in the kit?
                 
              • 1965fish

                1965fish Well-Known Member

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                I have a Lunati roller.
                Advertised Duration (Int/Exh): 310/314; Duration @ .050 (Int/Exh): 281/285; Gross Valve Lift (Int/Exh): .640/.640; LSA/ICL: 106/100.

                I have Total seal gapless rings in my 394 and 408 and like them so I wanted to use them on this engine.
                I'm sure the file fit moly rings are fine.
                 
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                • 1965fish

                  1965fish Well-Known Member

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                  Well. Made one run. An attempt anyway. Did not get a full pass so not much info to add. Had to abort the run. You can see why in the video.
                   
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                  • B3422w5

                    B3422w5 Well-Known Member

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                    Why did you abort it, because of the wheelie?
                     
                  • 1965fish

                    1965fish Well-Known Member

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                    It landed pretty hard. Ended up with a smashed oil pan.
                     
                  • B3422w5

                    B3422w5 Well-Known Member

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                    Hardest thing to get used to is not lifting while they are in the air
                     
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                    • 360duster

                      360duster Well-Known Member

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                      ouch, hope it´s not hurt too bad......great footage of the wheelie!

                      Michael
                       
                    • 1965fish

                      1965fish Well-Known Member

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                      Oh I did not lift for sure.
                      I just put Viking crusader double adjustable shocks on the front hoping it would land softer. My last engine did not make this much power so it did smaller wheelies.

                      IMG_0499.JPG
                       
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                      • Hysteric

                        Hysteric Well-Known Member

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                        Go over to Moparts and look up Dan Smith aka "Qwkmopardan" He has cars well into the 9's with less head and less cubes. How fast can you go with stock ported cast iron heads? 9.6's apparently and 9.59's with ported Edelbrocks.

                        318 for drag race use

                        He's obviously making more than 2 HP per cfm of airflow.
                         
                      • rumblefish360

                        rumblefish360 So close, yet so far away FABO Gold Member

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                        Freakin yea man! Super sweet & a hell of a carry on the front wheels.

                        Do you have a build thread?
                         
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                        • Hysteric

                          Hysteric Well-Known Member

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                          Use the search function on the website.

                          He also says his heads only flow 275 cfm at 525 lift....
                           
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                          • 1965fish

                            1965fish Well-Known Member

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                            If you're refering to my station wagon.
                            I did not do a build thread.
                             
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