Bottom End Shocker Build

Small Block Mopar Engine

  1. 67autocross

    67autocross A new iron curtain drawn across the 49th parallel

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    I’m going to get some work done to the shockers…I would like to see 300cfm out of them…
     
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    • rumblefish360

      rumblefish360 Getting closer FABO Gold Member

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      Then widening the port window like I did above and way back where the bolt hole protrudes into the port are the big keys from what I learn from @pittsburghracer who can shed more light on where to go and what to do.

      At the 280 cfm ProMaxx reports, you can still do quite well.
       
    • 67autocross

      67autocross A new iron curtain drawn across the 49th parallel

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      I witnessed to sbm shockers on the bench and they do flow as advertised…getting them to 300 might take some work…maybe try some different valve angles
       
    • pittsburghracer

      pittsburghracer FABO Gold Member FABO Gold Member

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      many Edelbrock, Edelbrock copies can hit 300 plus without opening the port window past what you can get by tubing them is very doable. (2.08 valve) The gains I made by relocating the pushrod over were at the most 15 cfm (330 area). So unless I see so mysterious gains at the track with the opened up port window I would never go with anything over a .350 offset. Hopefully I will find out if the delays, cost, and added work were worth the effort. I would have been racing weeks ago.
       
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      • 67autocross

        67autocross A new iron curtain drawn across the 49th parallel

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        I’m going to take them to the porter when they get here and see what he thinks he can do with them…he might even tell me to leave them alone…I’m dreaming of around 550hp at a low rpm on this build
         
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        • 67autocross

          67autocross A new iron curtain drawn across the 49th parallel

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          Okay….the only set of small block Shockers in stock at Promaxx has shipped to Canada…once they get here I will post some pictures and start figuring out what steps to take to get them flowing over 300cfm at 600 lift….might see if we can stuff a bigger valve in them for starters and see where we go from there…
           
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          • gzig5

            gzig5 FABO Gold Member FABO Gold Member

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            I think they already have a 2.08 intake valve, you are going to go bigger?

            Combustion Chamber ……63-65cc
            Weight …………………………55.00 lbs.
            Intake Runner ……………. 185cc
            Exhaust Runner …………..80cc
            Intake Valve Size …………2.08”
            Exhaust Valve Size …….. 1.60””
             
          • 67autocross

            67autocross A new iron curtain drawn across the 49th parallel

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            I'm not sure what they will show up with for valves or springs or chamber size...I didn't ask... the owner of Brazier Race texted me a set was coming up so I told him to grab them for me...
             
          • gzig5

            gzig5 FABO Gold Member FABO Gold Member

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          • 67autocross

            67autocross A new iron curtain drawn across the 49th parallel

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            A couple of years ago I witnessed a set on the bench and they went the numbers on the flow side of things...FYI another local builder just did a SBM with Shockers that went 580hp on the dyno and i hear it may be going back to try get it up to 600hp
             
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            • 67autocross

              67autocross A new iron curtain drawn across the 49th parallel

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              Heads showed up ….65cc 208/160 valves… bigger problem is no Air Gap intakes in stock… estimated time October 2022….

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              • mopardude318

                mopardude318 Well-Known Member

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                Those look nice.
                 
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                • 67autocross

                  67autocross A new iron curtain drawn across the 49th parallel

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                  Be
                  Be nicer if I had an intake to go with them
                   
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                  • 67autocross

                    67autocross A new iron curtain drawn across the 49th parallel

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                    If anyone has a new air gap let me know….
                     
                  • 67autocross

                    67autocross A new iron curtain drawn across the 49th parallel

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                  • rumblefish360

                    rumblefish360 Getting closer FABO Gold Member

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                    The Weiand is pretty good. Having one myself, I wasn’t happy with the core shift and the bolt hole clearance was crappy. I did some grinding. I wouldn’t buy another one.

                    Depending on cam and etc….. The Victor is real good.
                    However, allow me to quote….

                    So the Victor will have a seat.
                     
                  • rumblefish360

                    rumblefish360 Getting closer FABO Gold Member

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                    It wasn’t a lot of grinding but to get the bolts to sit flat on the intake AND in some spots, get in and threaded straight… NOT AMUSED. It is what it is and it was what it was. It does perform well.

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                    • mopardude318

                      mopardude318 Well-Known Member

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                      Woof. Grinding for the bolts like that irks me, I had to do that on my RPM air gap. It is what it is.
                       
                    • 67autocross

                      67autocross A new iron curtain drawn across the 49th parallel

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                      I started looking as well for the Weiand Air Strike but they seem to be out of stock also…really want to do the Air Gap as I’m convinced on a lower RPM stroker build they are the way to go…
                      I have a victory on one of my 340s…it’s perfect for buzzing around at 7000rpm…which is way higher than I want to spin this stroker
                      I’m still surprised the heads showed up so quickly
                       
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                      • rumblefish360

                        rumblefish360 Getting closer FABO Gold Member

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                        Yea man! When ProMaxx has them, they get it done.
                         
                      • Bodyperson

                        Bodyperson Pedal to the metal FABO Gold Member

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                        I got the Maxx 171. It took a couple weeks to build them but Boom they were here right after the shipped notification.
                        Great customer service. The customer service people are right there at the shop. I called to check on the progress and the guy says" let me go talk to the guys in the shop." After a little wait on the phone he says that the guy says they will be done Bla Bla bla and sure as hell they were. I mean these heads had my name on them.
                        The web site says the 171 will ship in February but that is wrong. He said they have a bunch of blanks in stock and not sure why the web site says that about February.
                        They look phenomenal with a little fresh grease hanging from the valve guides.
                         
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                        • Bodyperson

                          Bodyperson Pedal to the metal FABO Gold Member

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                          Just to be clear here, that weight is for the pair.
                           
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                          • QuickDart360

                            QuickDart360 Well-Known Member

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                            Just use a Victor 340 intake! My 360 ran much better with the victor than the airgap. I actually traded a member here for my victor 340 and love it!
                             
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                            • 67autocross

                              67autocross A new iron curtain drawn across the 49th parallel

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                              I have a Victor and still won't use it...this is a build I want to see make peak HP at 5500rpm
                               
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