Help!! 3.59 Stroker assembly

Small Block Mopar Engine

  1. Bigboy 68

    Bigboy 68 it is what it is

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    I just purchased a nice set of 3.59 stroker pistons they have .927 pins I need to know what rods I need to get and also where would I get a forged stroker crank for this set up thank you in advance
     
  2. Ottmundr

    Ottmundr 68 Fastback

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    Home - SCAT Crankshafts

    Cast cranks are around three fifty on summit. Forged above seven hundred if memory serves.
    I cant remember the prices on rods.

    On Scat's page just search for Chrysler engines, 3.58 stroke and that should get you to the part numbers list.
     
  3. 70aarcuda

    70aarcuda Master Hoader of SBM FABO Gold Member

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  4. Bigboy 68

    Bigboy 68 it is what it is

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  5. 70aarcuda

    70aarcuda Master Hoader of SBM FABO Gold Member

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    Thank you
     
  6. Biff

    Biff Well-Known Member

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    And that’s why this site is awsome:thumbsup:
     
  7. rumblefish360

    rumblefish360 So close, yet so far away

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    3.58 stroke in a 340 block?
     
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    • greymouser7

      greymouser7 Vagrant Vagabond “Veni Vidi Vici” FABO Gold Member

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      What is the part number and information (like compression ratio) for your pistons?
       
    • rumblefish360

      rumblefish360 So close, yet so far away

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      No matter the block, a KB-107 in the proper oversize will work or any equivalent piston, flattop or domed or dished.
       
    • Bigboy 68

      Bigboy 68 it is what it is

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      The Pistons are JE517 domed piston 11.75 compression 40 overbore 3.59 340 pistons
       
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      • stixx

        stixx Well-Known Member

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        Confusing to me is the 3.59 number... either it's 3.58 (Mopar 360 but not a stroker), or it's 3.79 which in fact would be a stroker crank.
        There are cranks for both strokes available... what rod length to use depends solely on the compression height of your pistons.

        Btw. funny strategy to buy pistons first and then worry about crank and rods? :poke:
         
      • rumblefish360

        rumblefish360 So close, yet so far away

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        Skip the 3.59 thing......

        A 360’s crank stroke is commonly referred at 3.58.
        A 340’s stroke is 3.31.
        The old tyme stroker trick in the ‘70’s was to cut the 360 crank to fit into the 340. This with a .030 overbore makes a 372 cid engine. Or 372.61 exactly which some places round up to 373. Which is fine. Factory does this as well. Up and down in the cid. This makes the stock 360 crank a stroker crank for the 273/318/340.

        I don’t know if there were big stroke stroker cranks available back then. I’m sure the 3.55 cid stroker crank and the down size crank for the 5.0 SCCA racing effort was. I don’t know about the other up stroke cranks like the 3.79 and all the others in between.

        Bigboy’s high compression 372 should be a rip to drive.
         
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        • greymouser7

          greymouser7 Vagrant Vagabond “Veni Vidi Vici” FABO Gold Member

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          If Bigboy 68 is Rodney (memory?) he has more mopar stuff than you and me combined. And my garage is full, with the yard overflowing. It’s more about the deal, unique builds for him. He has been known to make full size wagons go fast.

          I never got to see his 67/68 Dart build though.
           
        • greymouser7

          greymouser7 Vagrant Vagabond “Veni Vidi Vici” FABO Gold Member

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          The 355 crank was 3.51” (?yellow alloy?) forged. Not as strong as 4340. I think it was 10XX something alloy.
           
        • rumblefish360

          rumblefish360 So close, yet so far away

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          The 3.55 cranks comes in several (*3 I think*) sizes.
          There a 1053/1054... ahhhh I forget. True, not as strong as a 4340. But that is it a worry point.

          The particular one I have is (IIRC....) a 3.45 stroke.
           
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          • 4spdragtop

            4spdragtop FABO Gold Member FABO Gold Member

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            His name is Bob/Robert Mills, aka Superdart340 or Superdart426.
            Interesting to see what combo he goes with, I'm confused (easily) already.
             
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            • greymouser7

              greymouser7 Vagrant Vagabond “Veni Vidi Vici” FABO Gold Member

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              I understand bob mills to be a villain, not the same person I was thinking
               
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              • yellow rose

                yellow rose Doctor of Thinkology.

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                They are 1018 steel.
                 
              • '63GT

                '63GT Well-Known Member

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                Those pistons are probably made for NHRA Stock or Super Stock applications...
                The rules allow for .010 over stroke, making a OE 360 crank 3.59. it is stamped 3.59 so that the .067 or .070 deck Ht will be correct when the NHRA tech checks it in tear-down.
                (of coarse the engine builder would know that.. it would be made up for, when the block is cut)
                 
              • greymouser7

                greymouser7 Vagrant Vagabond “Veni Vidi Vici” FABO Gold Member

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                This is what he bought:
                JE pistons, SB Chevy, 4.08 bore, 11.75 compression ratio. | eBay
                I bet
                 
              • greymouser7

                greymouser7 Vagrant Vagabond “Veni Vidi Vici” FABO Gold Member

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                I have that crank 3.51” and those rods that 70aarcuda sold bigboy 68.

                I was thinking about the eventual rebuild of my 73’ Plymouth Road Runner’s 340 a few years down the road. A few year$ down the road though. The engine runs fine now.
                 
              • rumblefish360

                rumblefish360 So close, yet so far away

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                IF in fact true, that is a creative route that would work. Maybe minor machining on the slugs some? (Valve clearance/angles) IDK.
                After that, or actually before that, it’s piston pin & dome height to the deck height/cylinder head distance to be sorted out.
                I really don’t see a reason it would t work if your willing to put in the effort.
                 
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                • Bigboy 68

                  Bigboy 68 it is what it is

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                • rumblefish360

                  rumblefish360 So close, yet so far away

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                  Can you leave a more direct link?
                   
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                  • '63GT

                    '63GT Well-Known Member

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