Bottom End Shocker Build

Small Block Mopar Engine

  1. 67autocross

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

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    Okay seeing that my much maligned “free cam build” didn’t go over here as well as my other engine builds like the “old school 340 build “ and the “ mild magnum 360 build “….I think it’s time to leave that free cam build off this site until some of you are more mentally prepared for it… now that does not imply that this Bottom End Shocker Build is going to follow all engine build conventional thinking…but it might be a bit closer to normal than the mild magnum was…

    So here is the parts list…and unlike my other builds I will try to post prices(Canadian dollars)and part numbers

    Stock bore 340 block $100
    Mopar Caps $400
    ARP main studs $150
    Scat forged 4 inch crank $1000
    Rods TBA
    Pistons TBA but will be in the 10:1 range with some quench
    Heads are Promaxx Shockers CNC ported…. But they will get some additional porting and valve work
    Cam will be a solid lifter custom grind
    Intake will be an Ed Airgap dual plane that may see some hogging

    So keep in mind that this is not going to be some drag strip bracket engine that needs a 4500 stall and 4:10 gears to pull away from the stoplight…. I want the bottom end torque of a big block and peak power at 5500rpm…

    as always any input is truly appreciated….but I will still do it my way in the end!
     
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    • missing linc

      missing linc Loose nut behind the wheel

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      Where the heck did you find a standard bore 340 block for $100?
       
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      • missing linc

        missing linc Loose nut behind the wheel

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        I like the plan BTW, interested to see how it comes together.
        :popcorn:
         
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        • 67autocross

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

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          Some guy brought them into a local machine shop but he lost/sold the main caps off them…so I bought them because he had more blocks with caps…and he didn’t want to pay for a line bore…
           
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          • Garrett Ellison

            Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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            I like it!
             
          • 67autocross

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

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            You may not like it by the time I’m done…
             
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            • pishta

              pishta I know I'm right....

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              $100 for the block, $400 for the caps...about right. Add a >$200 line bore and badabam...$700 block...but its got a straight bore.
               
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              • 67autocross

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

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                I’ll post the price of the line bore when it gets done... but in Canada they won’t unload the block from your truck for $200…
                 
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                • Tbro

                  Tbro Well-Known Member

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                  Looking forward to seeing the numbers.
                   
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                  • gzig5

                    gzig5 FABO Gold Member FABO Gold Member

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                    I have about the same. Standard bore block with mismatched caps for $100us. I found set of two bolt caps from an R block for $100, so I'll go through with a line bore and such. Looking forward to your progress.
                     
                  • mygasser

                    mygasser FABO Gold Member FABO Gold Member

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                    he sold you more than one at that price??? :wtf:
                     
                  • 67autocross

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

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                  • 67autocross

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

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                    Honestly without caps they are really only worth $100…especially in Canada as machine shops probably charge $500 for a line bore…so you could end up with $1000-$1500 into the block by the time you are ready to assemble
                     
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                    • RAMM

                      RAMM Well-Known Member

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                      Thats so odd as I am beginning a build with a 340 block I acquired for free because of the exact same no caps scenario. J.R.

                      thumbnail_20210731_110500.jpg
                       
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                      • RAMM

                        RAMM Well-Known Member

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                        I charge a minimum of $500 for a line bore as well. A fully machined , ready to assemble block will easily be in the $1500 range. Totally agreed. J.Rob
                         
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                        • 67autocross

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

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                          What’s even more odd is you likely bought your caps off the same guy I did judging by the box they are in…
                           
                        • mygasser

                          mygasser FABO Gold Member FABO Gold Member

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                          i don't know if 318 caps fit, but if so wouldn't it be cheaper to get a 318 block with caps and use those on the 340 block? obviously not 4 bolt caps but unless it's a race build they're not really needed.
                           
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                          • Jadaharabi

                            Jadaharabi FABO Gold Member FABO Gold Member

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                            .
                            You would think you could pull set of caps off of a 318 and throw them over on another block and have it align bored and honed. But it just doesn't work that way because the caps are mated to the block differently between blocks. As in the Caps maybe side shifted on one block compared to the other. Then you can either weld up the cap where it joins to the block and file fit the cap over or get virgin caps and fit them.
                            Plus 318 caps are smaller than 340 caps as in less beef.
                            Last set of caps I got were those four-bolt main ones like in that picture in that box. I think I got them from Rocket here on Fabo.
                             
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                            • 67autocross

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

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                              I got mine from Rocket also…if I was doing a stock 340 rebuild I would throw 318 caps on it…but I’m going for around 550hp and more torque…
                               
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                              • rumblefish360

                                rumblefish360 Getting closer FABO Gold Member

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                                That’ll work well at the strip even though that’s not the intended build - :poke:

                                Just get a new car on a serious diet and you’ll zoom along pretty good!
                                 
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                                • cookietruck

                                  cookietruck Well-Known Member

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                                  sweet, interested to see a build with the Promaxx CNC heads. Are they pretty nice? Hardware is good?
                                   
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                                  • 67autocross

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

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                                    This 416 engine will end up in my purple beater….the 340 that is in now will get a refresh
                                     
                                  • 67autocross

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

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                                    I don’t have the exact set of heads in my hands yet…Promaxx had one set show up available this week so my local shop who is their Canadian dealer ordered them….saying that I have a friend that has built at least 20 small/big block Mopars with them and they have all been great…I have looked at lots of them personally and can say are well made…saying that the old EQ heads could make the same power for half price
                                     
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                                    • rumblefish360

                                      rumblefish360 Getting closer FABO Gold Member

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                                      I just put a set on a 10.5-1 - 340 w/a XL285HL on a 108. I’m a little ways from start up as there are other issues stopping me.

                                      Ops… (EDIT….) I swap out stock port Edelbrock heads for these knock off’s. ProMaxx’s CNC job does leave some port work on the table but yet gets some good numbers out of them. The power gain even with the same cam was very good.

                                      But yea I do like everything that it came with. I did do some work on the spring seat area for matching valve springs to the cam being used.
                                       
                                      Last edited: Jul 31, 2021
                                    • rumblefish360

                                      rumblefish360 Getting closer FABO Gold Member

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                                      I did some (Pittsburghracer) mods while I had them off the other engine. Just to get a little wider and what ever that offers. Which I have no idea…. LOL
                                      272116FC-7B2A-47F5-BA77-80A8E64D620E.jpeg 7E2B6CCF-C17F-4C67-9F41-75CA26C17758.jpeg
                                       
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