68 frame mount biscuit replacement
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Joined: Dec 2003
Posts: 73
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From: Keswick Ont
68 frame mount biscuit replacement
Hi guys
I have a 68 that I need to put in new biscuits at the body to frame mounts. 68 had solid, after that they went rubber. Is it better to put rubber/polyurethane in instead of the steel biscuits?
Thanks
Andy
I have a 68 that I need to put in new biscuits at the body to frame mounts. 68 had solid, after that they went rubber. Is it better to put rubber/polyurethane in instead of the steel biscuits?
Thanks
Andy
Thread Starter
Advanced
Joined: Dec 2003
Posts: 73
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From: Keswick Ont
So i assume even with the extra height of rubber/poly it is doable? Is there any worries with the extra height? I assume the steering linkage will give me more adjustment to compensate for the 3/8 extra height? Anyone do this to their 68?
Thanks
Andy
Thanks
Andy
Instructor
Joined: Sep 1999
Posts: 199
Likes: 12
From: Central MS
l too will do the replacement routine on my `68 using the rubber kit. As to the difference in thickness - would it be feasible to slice the offending 3/8" from each rubber spacer using a bandsaw? You would increase ride harshness but these cars came with aluminum spacers anyway. Another side effect of the extra 3/8" is exposing the frame rails. Good/bad idea?
Racer
Joined: Aug 2005
Posts: 431
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From: Oita, Japan
Originally Posted by David68
l too will do the replacement routine on my `68 using the rubber kit. As to the difference in thickness - would it be feasible to slice the offending 3/8" from each rubber spacer using a bandsaw? You would increase ride harshness but these cars came with aluminum spacers anyway. Another side effect of the extra 3/8" is exposing the frame rails. Good/bad idea?
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Racer
Joined: Sep 2004
Posts: 424
Likes: 2
My buddy and I both have '68 convertables. I have the original body mounts, he has switched to the rubber. His car has cowl shake, mine does not. He plans to switch back to solid mounts. I would not use rubber, and would be wary of any extra height induced by Poly.
Race Director
Joined: Feb 1999
Posts: 16,978
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From: In Dreams There Is Truth Ohio
Originally Posted by jimmygmartin
My buddy and I both have '68 convertables. I have the original body mounts, he has switched to the rubber. His car has cowl shake, mine does not.
Racer
Joined: Sep 2004
Posts: 424
Likes: 2
Originally Posted by GDaina
Huh? Cowl shake? What is that? If the car shakes, that is not the problem of the rubber mounts. He has other issues and needs to address those, rather than blame the rubber mounts. Mine is a 68 roadster, I replaced the aluminum mounts with rubber sometime in the mid 70's. Best move I ever made. F-41 suspension and aluminum body mounts make an extremely harsh ride. With rubber mounts, no more fears driving over bumps.
Race Director
Joined: Feb 1999
Posts: 16,978
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From: In Dreams There Is Truth Ohio
Originally Posted by AndyMacLeod
Thanks for all the replies guys. So to you guys who have made the change to rubber/poly. Did you stick them straight in or have to cut them or modify anything?
Drifting
Joined: Oct 2003
Posts: 1,426
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From: VetteMOD
St. Jude Donor '05-'07
Originally Posted by jimmygmartin
Cowl shake is in the windshield/dash area. Convertables of all makes and models are known for this (my wife has a new Sebring Conv with significantly more cowl shake then my '68). My car and my buddies have been garaged there entire lifes (we both purchased them in '76). I disagree that ride harshness has anything to do with the body mounts. If you have a harsh ride it is due to some other problem ie. your suspension.
Racer
Joined: Sep 2004
Posts: 424
Likes: 2
Originally Posted by BBShark
My 68 convertible does not have the underdash braces that later cars had. This was the "fix" for cowl shake by GM. Maybe adding these would help your situation and save you from replacing your body mounts.