Big Block Motor Mount Suggestions

Brakes, Steering & Suspension

  1. hsorman

    hsorman FBBO Gold Member FBBO Gold Member

    Messages:
    3,328
    Likes Received:
    3501
    Joined:
    Aug 8, 2011
    Location:
    Lansdale, PA
    Local Time:
    7:42 PM
    I have a 1970 Road Runner with its original big block K-Member.

    I am replacing my 383 engine with a 400 stroker that makes over 600 Lb-ft of torque. I have heard that stock motor mounts are not up to the task (which is what I currently have). I do not want to run solid mounts as this is a street driven car that I will drive extensively.

    I have seen the Schumacher PolyLoc motor mounts, which look like they could be a decent choice, but any other or better suggestions for motor mounts?

    As always, I appreciate the brain trust here at FBBO! Thanks in advance!

    Hawk

    (@PST looks like you have Schumacher PolyLoc mounts, although part number was not clear to me - is it POLYBXEPSM?)
     
  2. tnfastback

    tnfastback FBBO Gold Member FBBO Gold Member

    Messages:
    1,029
    Likes Received:
    1730
    Joined:
    Jul 4, 2016
    Location:
    East Tennessee
    Local Time:
    7:42 PM
    I used the 440 source reinforced mounts. However only the drivers side mount is reinforced which I guess is ok. I also am putting a factory torque strap on just because it looks cool :thumbsup:
     
    • Thanks! Thanks! x 1
    • CoronetDarter

      CoronetDarter Well-Known Member

      Messages:
      1,383
      Likes Received:
      1433
      Joined:
      Oct 13, 2013
      Location:
      Lincoln, CA
      Local Time:
      4:42 PM
      • Thanks! Thanks! x 1
      • hunt2elk

        hunt2elk FBBO Gold Member FBBO Gold Member

        Messages:
        5,619
        Likes Received:
        3853
        Joined:
        Jul 15, 2009
        Location:
        WI
        Local Time:
        6:42 PM
        I went to using solid Moroso mounts after a failure of a Schumacher Polyloc. Never used the Mighty Mounts, but have not heard anything bad about them.
         
        • Thanks! Thanks! x 1
        • Agree Agree x 1
        • 68Moparmaniac

          68Moparmaniac Well-Known Member

          Messages:
          806
          Likes Received:
          1297
          Joined:
          Jan 18, 2019
          Location:
          Utah
          Local Time:
          5:42 PM
          What failed on the polyloc mounts? What was the beast these were bolted to?
           
          • Like Like x 1
          • hunt2elk

            hunt2elk FBBO Gold Member FBBO Gold Member

            Messages:
            5,619
            Likes Received:
            3853
            Joined:
            Jul 15, 2009
            Location:
            WI
            Local Time:
            6:42 PM
            It was on a 451 making about 535hp. Oddly it was the passenger side that failed. Mike at Schumacher wanted it back and alluded to the fact he had some others do the same thing, although failure of the drivers side was far more common.
             
            • Thanks! Thanks! x 2
            • 68Moparmaniac

              68Moparmaniac Well-Known Member

              Messages:
              806
              Likes Received:
              1297
              Joined:
              Jan 18, 2019
              Location:
              Utah
              Local Time:
              5:42 PM
              So was it the vulcanizing that failed?
               
              • Like Like x 1
              • hsorman

                hsorman FBBO Gold Member FBBO Gold Member

                Messages:
                3,328
                Likes Received:
                3501
                Joined:
                Aug 8, 2011
                Location:
                Lansdale, PA
                Local Time:
                7:42 PM
                I never thought about this, but it certainly makes sense that only the driver's side is reinforced since that is the one that gets pulled on while the passenger side gets compressed.

                Cool. The Mity Mounts seem to have the same idea as the Shumacher. I'll look these up.

                I do have a build thread. In continuing my theme, it is called Hawk-Rod: The "Tune Up". In there, you can see my continuing follies as I try to pretend I'm an ace mechanic!!
                https://www.forbbodiesonly.com/moparforum/threads/hawk-rod-the-tune-up.183169/

                OK, so much for my response above about only needing the driver's side! Out of curiosity, it what manner did it fail? Any additional description would be appreciated.

                Thanks,

                Hawk
                 
                • Thanks! Thanks! x 1
                • hunt2elk

                  hunt2elk FBBO Gold Member FBBO Gold Member

                  Messages:
                  5,619
                  Likes Received:
                  3853
                  Joined:
                  Jul 15, 2009
                  Location:
                  WI
                  Local Time:
                  6:42 PM
                  Yes. Mike recommended a bolt through drivers side mount and a torque strap until he got the problem figured out. He sent me these items free of charge. Standup guy imo.
                   
                  • Thanks! Thanks! x 2
                  • hsorman

                    hsorman FBBO Gold Member FBBO Gold Member

                    Messages:
                    3,328
                    Likes Received:
                    3501
                    Joined:
                    Aug 8, 2011
                    Location:
                    Lansdale, PA
                    Local Time:
                    7:42 PM
                    Maybe I should wait on the Schumacher Polyloc's if they are having issues. Plus, they seem to be out of stock in several places I looked. Maybe that's because he is working on them?

                    Price seems reasonable on the Mity Mounts so I just ordered a set. I need to get this engine back in and get some miles on this thing before the trip to make sure everything is working!

                    Gentlemen: Thanks for the help as always!

                    Hawk
                     
                  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
                    By continuing to use this site, you are consenting to our use of cookies.