OBS Motor mount Question

[Nak]

OK, I have my engine bay & undercarriage all cleaned up and I'm starting to put the new parts in. My motor mounts, the rubber encased in steel mounts that bolt to the frame, don't quite line up? That is, when the top two bolts are just barely tight, the bottom bolt hole surface is a good 1/4" away from the frame???? BTW, the original motor mounts are identical. It's like you need a washer between the frame and the mount at the bottom bolt. Is this the way it's supposed to be???? Like I said, the original mounts fit the exact same way. No washer was used originally. Both left and right sides are like this.

[Nak]

After looking at this closer, the bottom of the mounts are convex. So, tightening everything down is going to compress the rubber portion. Is this intentional? Something to hold the rubber portion tighter? BTW, these are GM mounts, not aftermarket. (Getting hard to find...)

[Cardot60]

That doesn't seem right, check to make sure you're using the right bolt holes. It might seem stupid but I've seen frames that have a lot of similar spacing holes in the engine mount area. Also you can check the bottom of the mount for any interference. Hopefully it's something simple for ya. I know I hate to re-invent the wheel with the little things.

[Nak]

It's the right bolt holes. The bottom of the mounts are convex, that is the cause. I'm just wondering if they are supposed to be that convex, so that tightening it down will compress the rubber. The old mounts also have a convex bottom, but not quite as convex.

[Cardot60]

Any relation to either one of these bushings? It's been a while since I've taken the frame mounts off but I do seem to remember the rubber bushings getting compressed as I tightened them down.
http://i.tfcdn.com/img2/N7bkHGwADYnL...v8*/fvUG-v8A.B

[Nak]

em-2637.jpgThe one on the left looks like what might be encased in steel. It doesn't look like you can get it out of the steel though? Here's a pic of what mine look like.

[Cardot60]

Well, looks like you've double checked the hell out of this one, maybe try tightening it down as even as possible and see how it goes?