440 Piston Question

Big Block A body Tech

  1. siuauto

    siuauto Well-Known Member

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    Hey everyone, I am building a 440 and I have a set of SRP forged pistons on a set of 6 pack rods. I also have a set of Eagle H beam rods. I would like to put the SRP pistons on the H beam rods but my machinist is hesitate about pressing the pistons off in fear of cracking them. Has any one else heard this or experienced this? Thanks in advance.
     
  2. Lelo Dart

    Lelo Dart * FABO Gold Member

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    Oh yeah very likely. They usually break while getting pressed off. I asked about the old pistons a couple off times and was told they are junk after being removed from the rod. 6 pack rods should be strong enough for most applications. IMO
     
  3. brian6pac

    brian6pac Well-Known Member

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    There is a special tool to hold the rod when pressing, If your shop doesn't have one move on.
     
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    • Plymouth 65

      Plymouth 65 Floorable Deplorable

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      Those 6 pack rods are very heavy, the h beams would be a better option. 65'
       
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      • moparstud440

        moparstud440 Well-Known Member

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        I went thru something very similar about 15 years ago. Put together a motor used stock rods and Speed Pro pistons. Ending up having an issue with the cam and tore motor apart and bought a set of Scat rods since I had a little extra money. Machine shop ended up breaking 2 of the 8 pistons when removing them. So after buying 2 replacements I got the engine back together. Being cheap and on a budget at the time ended up costing me more than if I'd just bought good stuff to begin with. I also think that a machine shop SHOULD be able to do this, but as with anything some shops are better than others.
         
      • brian6pac

        brian6pac Well-Known Member

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        OTC wrist pin press, the piston never has any pressure put on it.

        2287501_0.jpg
         
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        • siuauto

          siuauto Well-Known Member

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          Thank You!!!
           
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