gbak

Should I change motor mounts as I'm going to swap motor from a 327 to a 383, with a lot of more torque?
Have stock motor mounts now.

Godfathers Ghost

You'll be fine as long as theyr'e not damaged and that stroker isn't putting out ungodly amounts of power. But new poly mounts from Energy Suspension or others (you can get them from Summit, Jeg's,etc) are pretty cheap. Or get some solid mounts if you are making a ton of power. One thing though that most don't know, don't mix differant types of engine and trans mounts, go all rubber, all poly, or all solid. Mixing can cause awkward stresses and breakage.

Durango_Boy

I only disagree here, because running a poly or even rubber trans mount is fine if both motor mounts are solid.

texbeasr3

Avoid using rubber motor mounts. My mild 350 tore 2 up in one year.
I purchased poly form AutoZone...good value, and the have not broke it yet. Solid mounts might be better.

HT1663WB

Durango_Boy

There have been a lot of discussions lately about using solid mounts and how they are 100% beneficial. Never break, and give the response a quick crisp feeling.

gbak

Don't think I will go for solid mounts.
Poly seems better for a street car.

What about heights of poly mounts, are they the same as my stock?
I've heard that they will not have the same height.
Is that really so?

Sigforty

go with Poly. They swap in without any issues and do not flex as much.

JoeRags

My 383 ripped a brand new rubber mount in two the first time I stepped on it hard.

I put in Energy Suspension poly mounts.

zaphodbebullbrox

i put poly motor mounts and trans mount after my stock ones gave way. a lot more power to the wheels, so much so i broke a u-joint that same week. don't know if there is a connection?

Durango_Boy

You just found a good way to determine if you have weak U-joint. I think that's the way to go anyway.

King Lear

I put the same in my 383 no problems or flexing of any kind.

gbak

Most of you seems to be satisfied with the Energy Suspension mounts.
Is it this one from Summit #ENS-3-1114G?

King Lear

Yep they look the same.

genuine1980

I just installed poly motor mounts, but left the tranny alone... I hope it ok

BerniesVette

The tranny doesn't flex enough to have a problem breaking the mount. Rubber serves well for the tranny mount. The flexing comes from the engine torquing from left to right which causes the left motor mount to go then the right one.
Bernie

hubes

so is it ok to use 2 poly engine mounts and a rubber tranny mount?

Durango_Boy

Yes.

King Lear

I did it for two years before I changed my tranny mount to poly. No problems at all. If all you do is street driving I cant believe you would ever have a problem, other then dry rot from age not because you had a poly engine mount and a rubber tranny mount.