400 Stroker need Stud Girdle

Engine, Trans & Driveline

  1. m79ded

    m79ded Well-Known Member

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    Hi
    I'm wondering at what power level will I need to install a girdle on my 400 stroker. I'm planning to upgrade my 451 to 511 and wanted to keep it safe and reliable. I do have main studs already on it.I got TFS240's with a 242-246 mechanical cam from Hughes with a Eddy RPM intake.
    I'm sure with all the builds that our members have gone through, they will be able to shed some light on the subject.
     
  2. Badvert65

    Badvert65 Well-Known Member

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    It never hurts to have the stud girdle in place, but I have heard that 600-650 HP is the limit without having some means to stabilize the main caps.
     
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    • 68 HEMI GTS

      68 HEMI GTS Well-Known Member

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      I’ve used a few of them with stock caps on 400’s. Until I tear one down I probably won’t have an opinion on how well they work on the mopars. They certainly don’t hurt though.

      This is my 511 in the roadrunner
      05ECB636-10A1-4C48-A5FD-036B0695B689.jpeg
       
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      • GITEX

        GITEX FBBO Gold Member FBBO Gold Member

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        IMG_0902.JPG Been running one on my low deck 500 for 4 years. Just for my peace of mind i guess. One tear down mains looked perfect.
         
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        • Steve009

          Steve009 FBBO Gold Member FBBO Gold Member

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          I’m currently building a 470. My engine builder says aluminum mains and a girdle aren’t needed until 700-750hp so I’m listening to him. I’m expecting 600hp for mine and just used arp main studs and a fresh line hone. I’m also not bringing mine to the track either.
           
        • 68 HEMI GTS

          68 HEMI GTS Well-Known Member

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          He’s wrong, I’ve had cap walk on 500hp big blocks. And st the 750 range, I’d be looking for an aftermarket block for any kind of longevity
           
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          • Steve009

            Steve009 FBBO Gold Member FBBO Gold Member

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            Well I’m going to listen to him. He’s built tons and competed in major engine competitions so I’ll let you know in a few years who was right.
             
          • m79ded

            m79ded Well-Known Member

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            I see you and 68 Hemi GTS have them. Where should I look for one? Good price and product?
            Thanks
             
          • 68 HEMI GTS

            68 HEMI GTS Well-Known Member

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            I didn’t say it’ll blow up, caps will walk though.
             
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            • GITEX

              GITEX FBBO Gold Member FBBO Gold Member

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              I purchased mine from Mancini Racing
               
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              • BSB67

                BSB67 FBBO Gold Member FBBO Gold Member

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                As they do on just about everything
                 
              • m79ded

                m79ded Well-Known Member

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                Yup I went and looked and saw 440 Source has it for 349, Hughes has it for 449 both of these are without new caps. Any difference in the 2 other than price?
                The Mancini setup includes caps, meaning that I would need to Line Bore the block.
                 
              • 68 HEMI GTS

                68 HEMI GTS Well-Known Member

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                There all about the same. Source one is ok. If you wanna stick money into a stock block the brc set up with alum caps and matching girdle is way above the others. A lot of machine work involved though.
                 
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                • 68 HEMI GTS

                  68 HEMI GTS Well-Known Member

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                  Source Hughes Same, I’ve used both
                   
                • 68 HEMI GTS

                  68 HEMI GTS Well-Known Member

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                  Caps the block will need align bored. I use to bore them close then finish with an align hone when I machined for a living.
                   
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                  • moparcrazy

                    moparcrazy Well-Known Member

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                    • Yatzee

                      Yatzee Well-Known Member

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                      I'm at 635 HP with my 512 stroker and I installed a custom made girdle and billet mains and caps beneath it. The bottom end had to be machined once the caps were on to ensure complete flatness across the block skirt and caps prior to installing the girdle. That's the correct way to do it. You don't need the crank in it when the machine shop does it. They not only hold the block from splitting, they also support the crank caps. Mine is 3/8 thick and milled perfectly flat when I bought it. Having two seams now instead of just one between the oil pan and block with a girdle, you really need to ensure flatness of all surfaces and "The Right Stuff" instead of gaskets is highly recommended. You'll also have to extend your pickup and really don't need a windage tray at all. After all was said and done, I had to use 1/8 inch of shimming under my mounts for pan and drag link clearance. In reply to the issue with the caps, mine go completely across the skirt under the girdle and they're not "walking" anywhere. Don't forget that you'll need new special bolts to do this.
                       
                      Last edited: Feb 13, 2018
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                      • PurpleBeeper

                        PurpleBeeper Well-Known Member

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                        Sorry to hijack, but I have a related question...will a windage tray still fit with a main stud girdle?
                         
                      • Yatzee

                        Yatzee Well-Known Member

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                        No, not even the expensive ones. You won't need it by virtue of the openings in the girdle. You will/should buy a new pickup but even it will have to be heated and slightly bent depending on the depth of pan you use. I bought a Morosso windage tray but couldn't use it but their pick-ups are cats ass for quality.
                         
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                        • BSB67

                          BSB67 FBBO Gold Member FBBO Gold Member

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                          Yes, and I would use one.
                           
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