My 66 GS hardtop body mounts

Discussion in 'Chassis restoration' started by GS Spoken Here, Nov 30, 2014.

  1. GS Spoken Here

    GS Spoken Here Well-Known Member

    Picture #6 of Lower washers, bolts, and rubbers, washers are the same except the 2 rear one' they are slightly smaller. Rubber mounts all seem to be the same, front 4 bolts and 2 rear are the same length, the center under the door, are shorter, not sure about the 2 in the rear wheel well, had to cut off heads to remove.

    Picture #5 of drivers side front, the inner mount is larger.

    Picture#4 of rear wheel well, the mount is larger

    Pictures #2 and 3 of rubber mounts only, no bolt, 2 each side under rear seat area and over rear spring pocket, these are the same but smaller in dia and height than 6/72 ones.

    Picture#1 of rear mount, the steel insert appears slightly different.

    This car appears to have never been apart.

    Posting for reference.
     
    Last edited: Nov 30, 2014
  2. copperheadgs1

    copperheadgs1 copperheadgs1

    Only problem now is very limited types in the aftermarket.
     
  3. GS Spoken Here

    GS Spoken Here Well-Known Member

    A few more things about my mounts.

    1. The frame holes under the door area, is smaller than the rest.

    2. Got Ground Up, mount set, and look correct for front 4, and rear 2, and to use on door area, you will need to either enlarge the frame hole or cut down the mount insert.

    3.Still looking for the 4 solid rubber ones.
     
  4. wkillgs

    wkillgs Gold Level Contributor

  5. GS Spoken Here

    GS Spoken Here Well-Known Member

    Walt thanks for the info and part #, yes I have a restoration specialties 2013 catalog and thought the 20024 would work for the solid one's. my sold one's are the same diameter(2") and slightly less that the 3/4" that the 20024.. Mine are old and may be slightly compressed. Was not sure if the frame hole diameter was the same. My rad supports mounts may have been changed a long time ago. They look like they could be saved. I am going to clean them up and see if the metal sleeve's will come away from the rubber and compare to 20012 and 20003. As I remember, 65, 6, and 7 rad were different, one or some year had a square mount, and not sure if Skylark and GS the same. I need to look at my 5, it has original mounts and cannot remember if my 7 got new rad mount when we changed the frame mounts years ago. I think I have one or two sets of extra, rad mounts from them years, hope I marked them when I removed them.

    Do you remember if your original mounts under the door frame hole was slightly smaller, and the ones in the rear wheel well were slightly larger?

    Thanks Bill.
     
  6. wkillgs

    wkillgs Gold Level Contributor

    Bill, I bought the Ground up kit, one from cars, and another from Year One. They're pretty much the same bushings. 2" dia and 3/4" thick. The Ground Up kit has the flanged bolts that are closer to original than the hardware store grade stuff from Y1.

    Mounts #1 and #2 are at the cowl. The above repo mounts are good matches to those.
    #3 mount is under the door. Yes, it is a smaller frame hole, but the repo mount can be trimmed to fit. Installed height is 0.100" less than #1 and 2, so it might be thinner.
    #4 & 5 mount is the 'puck' style that presses into the frame (no bolts). #4 in front of r wheel and #5 over the axle. Mine were about 0.072" thick, and 2" in diameter. The resto specialties #20024 are a good match (3/4" thick, 2" dia). The CARS #BM11 is a little bigger at 13/16" thick and 2-1/16" diameter. You can use the kit's repo mounts, they fit well but look different.
    #6 mount is at the trunk just behind the wheel. My used and abused original was 2.6" diameter and 0.9" thick. The other part (insulator) was 1.8" and 0.70" thick.
    #7 mount is near the back bumper. 2.1" dia, 0.74" thick.

    Installed thickness should be 0.630"-0.730" for #1,2,6,7. 0.530"-0.630" for #3.

    I bought some mounts from Restoration Specialties at a swap meet.... just pulled them out of a bin, so I don't have a pn. Found a large dia one for #6, and some that work real well for the rad support. I did have to drill out (hole saw) one of the rad support ones to fit the orig metal sleeve. I'll have to venture out and measure the ones I bought.
     
  7. GS Spoken Here

    GS Spoken Here Well-Known Member

    Walt, thanks much for all that info. I need to digest it a bit. Yes, RS 20024 for the puck style, and the #20012 looks correct for the bottom of my core support bushing. I have a pair of almost new top ones. Thanks again, Bill.
     
  8. GS Spoken Here

    GS Spoken Here Well-Known Member

    Follow up to mounts I bough from Restoration Specialties, the solid #20024 is a very good fit compared to original see Picture's 1&2. The lower core support #20012 are correct except the inside diameter of the center hole is 3/4" and the OEM is 1". this needs to be enlarged to fit over the metal sleeve. See Picture's 1&2.. Not sure what the best way is to enlarge the hole.
     

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  9. wkillgs

    wkillgs Gold Level Contributor

    The #20012 must be the same one I bought. I used a hole saw to enlarge the hole. I ruined one bushing, but second attempt went well.
    Problem is the the wall thickness is thin and the rubber moves around too much. I wonder if freezing the bushing or putting a harder insert in the hole (wooden dowel?) would stiffen it up and make drilling easier.
    I wonder if Restoration Specialties could make the bushing with a larger hole?
     
  10. GS Spoken Here

    GS Spoken Here Well-Known Member

    Walt, thanks for the reply, yes that is the problem I see. The thin upper wall thickness. Good thoughts on how to do. I was thinking of finding a smaller tooth hole saw or trying a drum sander in a high speed tool. Thanks Bill.
     
  11. tdacton

    tdacton Gold Level Contributor

    Could you use a hole saw for the right dia. and bench grind away the teeth and create a sharp edge around the cutting edge. Heat the tool up and push it through?
    Troy
     
  12. Topless64-455

    Topless64-455 Well-Known Member

    Bill, were your core support mounts thinner than the body mounts. My 67 didn't have any just some wood blocks. The car was not a driver but roller when I bought it. I have what I think is a core support mount in a box and the part that looks to have been on the frame (has rust pits on the metal side), then rubber and then a metal top where the core support sat on top. The top piece is rubber and has a washer molded into it where the nut tighten down. The bottom piece is maybe 5/8 think including the metal on both sides and the piece on top of the core support looks to be about 3/4 of an inch?
     
  13. ctlikon

    ctlikon Well-Known Member

    For the 66-67 Core support mounts, mine are square and I thought that was OEM for those years. Am I mistaken? Someone replaced mine (67) at some point and butchered them so I will be trying to replace with the most correct as possible.
    Thanks, Craig
     
  14. GS Spoken Here

    GS Spoken Here Well-Known Member

    Ed, yes my 66 mounts are about 3/4" and the core support are about 5/8" The 66 one's are round with metal sleeve washer together and the rubber, then a lighter step washer on top. The top rubber with washer molded, like you describe. I did buy the Restoration Spec #20012 but did not use, my rubber were OK. I will look at my 67 and confirm they are the same. I am thinking they are and the 65 is the square one. I may have enough extra to build a set of core support mounts for a 6/7. Let me look, thanks Bill.
     
  15. GS Spoken Here

    GS Spoken Here Well-Known Member

    Ed, good talking to you the other day. Here is a picture of the core support parts you said you need. PM me your address and I will send.

    I did take some pictures of the two pass trunk drops I have one Skylark, one Tempest. Not very much the same, both ends different and the cent ribs are different. I will post a few but if you want to see all PM me your email. Thanks Bill.

    First and third pictures are Pontic, Second is Skylark.
     

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    Last edited: Jan 30, 2016
  16. GS Spoken Here

    GS Spoken Here Well-Known Member

    One more picture of Pontiac wide vertical ribs.
     

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  17. Topless64-455

    Topless64-455 Well-Known Member

    Bill,

    I pulled two mounts from under the trunk pan support braces behind the rear wheels and compared them to the repros I got from ss396.com. The old ones are wider than the new?

    Did you have this issue on yours?

    Should I use the small ones or can I get the wider ones. The height is correct.:Dou:
     

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  18. GS Spoken Here

    GS Spoken Here Well-Known Member

    Ed, yes I found the ones by the rear wheel wells were larger in diameter. My fix was to use a pair of 68/72 ones there, My frame mounting pads in that area were slightly rusted and a little ragged on the inside. I increased the hole size to fit the larger mount. You could also cut down the 68/72 mount to fit the frame hole. As far as the height, overall the bottom was about the same, on the 68/72 the metal is flush with the rubber, the other the metal is below, so the rubber is less on the small one but the overall about the same. The metal washer on the rubber cap is on top the rubber, on the other it is flush. This makes the overall about the same. If your metal frame pads are good you can cut down the mount, using a belt sander. I did his for the ones under the door, not sure why the frame hole is slightly smaller. If you need a pair of the 68/72 ones I used I have extra. Thanks Bill.
     

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