1. Evan Dutch

    Evan Dutch Well-Known Member

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    Hey.
    Can someone tell me the dimensions of the bolts that fasten the clutch assembly to the flywheel? Thanks.
     
  2. yellow rose

    yellow rose Doctor of Thinkology.

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    Kinda depends on the pressure plate.

    For sure the shoulder needs to go into the flywheel. If you have what they call the scalloped pressure plate it takes its own bolt. I used to know the part number off the top of my head, but no any more.

    I'll grab a bolt for the scalloped plate and take some pictures in a bit and post them. If you have the scalloped plate and don't use the correct bolt (or try studs and nuts) you will fracture the cover. Learned that the hard way.
     
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    • Evan Dutch

      Evan Dutch Well-Known Member

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      If it helps. I’m using the 440 source billet 130 tooth flywheel that will work with 10.5” clutch. This is the clutch kit I’ll most likely be using.

      5E33B153-C76F-46A2-BFA3-675C90CC725F.jpeg
       
    • yellow rose

      yellow rose Doctor of Thinkology.

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      Dam I forgot to take those pictures today.

      Shit. I'll do it first thing in the AM and I'll take a couple of shot of the pressure plate. That way you can see what I'm talking about.

      For that pressure plate I think a shouldered bolt will be fine. The bolts I use would also work, but I need to get the part number. I started using those bolts exclusively after I cracked to pressure plate covers.
       
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      • Evan Dutch

        Evan Dutch Well-Known Member

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        Not a problem. Thank you.
         
      • Daves69

        Daves69 Well-Known Member

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        From the MP P4529113 kit if it helps...…….
        FlyClutAttBolts.jpg
         
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        • yellow rose

          yellow rose Doctor of Thinkology.

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          That lower bolt MIGHT work for a scalloped pressure plate but for damn sure not the top bolt.

          I'm going to post some pictures here in a minute.
           
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          • yellow rose

            yellow rose Doctor of Thinkology.

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            image.jpeg image.jpeg image.jpeg image.jpeg image.jpeg image.jpeg

            This is my personal junk. From the top:

            The bolts designed for the scalloped pressure plate.
            The next picture shows why you need that bolt. The shoulder is about to go into the cover and that's what centers the cover. The bolt shoulder centers the cover.
            The next picture is a Borg & Beck/Long pressure plate that uses a scalloped pressure ring. This in a clutch done by Cale Aronson at Black Magic Clutches. Those are his fingers that he designed. And you can see I can also adjust for base pressure and counter weight.
            The next three are pictures of what a sintered iron disc looks like. Some of what is being called a sintered iron disc is NOT site red iron. It's some bronze metallic shit we called Velvet-Touch or some shit like that way back in the day. You can see that this is an unsprung hub and has no way to even have a marcel spring.

            This clutch is used in what was a 12.4X at 109.XX MPH street car. My wife can drive the car.

            So...after all this, that's the bolts I use in the pressure plate. I had to think about it. When I bought my new flywheel I asked McLeod to throw in some new pressure plate bolts and they did. For free. So I don't have a part number, but you need a bolt with a long shoulder on it because that shoulder goes through the cover and into the flywheel to line everything up.

            Hope this helps.
             
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            • Daves69

              Daves69 Well-Known Member

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              FWIW, The "MP P4529113 kit" includes flywheel AND clutch cover bolts.
               
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              • Evan Dutch

                Evan Dutch Well-Known Member

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                I appreciate the time you guys took to help me out.

                I’ll have to work on finding the shouldered bolts.

                Thanks.
                 
              • yellow rose

                yellow rose Doctor of Thinkology.

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                Is the above picture screwing with me? Are you saying that's the MP kit and the top bolt is a flywheel bolt? Damn. My glasses ain't to good.


                I will say I haven't used anything but Pro Series ARP flywheel bolts in I don't know how long.
                 
              • Evan Dutch

                Evan Dutch Well-Known Member

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                I’ll call McLeod tomorrow and see if they can send me some of those bolts.
                 
              • Daves69

                Daves69 Well-Known Member

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                Yes sir!

                upload_2018-9-17_20-14-0.png


                For reference a flywheel bolt from the kit next to a stock flex plate bolt...……..

                FlyVsFlex.jpg
                 
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