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I have put polyurethane subframe bushings under my 67 Convertible and would like to know what the torque specs are for those bolts. So far, when I tighten them up, they are squishing pretty good and the bolt does not seem to tighten up solid yet. These are Prothane Polyurethane bushings that I bought from Rick's 1st Gen.

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Rob Rice
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I don't know what the torque would be, but you should keep tightening the bolts till the inner sleeves bottom out.

Larry
 

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i had to "dig" a little on the internet,but found that the bolts should torqued to 70-90 FTLBs. this is for a 70,others are probably similar...hope this helps..

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70camaro(350)ground-up restification,350 slightly modified
 

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The center and rear bolts: 75-95 lb-ft with a 60 lb-ft residual after rolling.
Radiator support: 30-40 lb-ft.

These came from the Chevrolet assembly manual (the best piece of referance literature I have ever used.) Be sure the bolts are not rusted and the frame nuts are clean and well lubricated. Use only Grade 8 hardware if replacement is necessary.
 

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Sounds to me like you may have not installed the metal sleeves in your new bushings. That's the only reason I can think of as to why your bushings are squishing down. Polyurethane is basically plastic, and compresses very little under normal torque specs. I installed Energy Suspension bushings in the front subframe of my 67 Camaro and the bolts tightened up without the bushings squishing out. Hope this helps.
 

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In the process of doing the front on my 68 now,45 foot pounds for the radiator support and 90 for the rest( this was for stock rubber) ,hope this helps.

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