Can a bolt to the block be left out of a replacement motor mount?

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12-19-2014, 07:39 AM

#11

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Originally Posted by jwfirebird

i never heard about using the same ones. i guess it depends how good the original design is. i have been using stock 350 rubber engine mounts for about 10-15 years, when ever i swapped it to the 305 that was in there before the 350, that was all they had at the parts store at the time. but i went with the poly trans mount for a th400 because they had it and its a member of the suspension on the f-bodies. the stock rubber engine mounts have seen alot of track passes, i thought they would give me a problem but not so far.

I had a 86 firebird with a TPI 350 and a 700r4, I know what your talking about with the trans mount, the torque bar from the rear end does make a big pull on the back of the trans. I put like 4 mounts in mine in 2 years. When 2nd gear would hit hard Bang! the trans is hitting the floor pan if the car.

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12-19-2014, 09:11 PM

#12

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mine originally had the 2.8, so that didnt have enough power to break anything. i figured that would happen though when i changed to the 8 cylinder stuff. the poly one has been fine though. its always been a weird design to me, doesnt seem like they would want that stress on the trans housing. but they hook good as long as you dont screw up the angles of the control arms and torque arm.