Fyi, if you have poly mounts, inspect them.
Poly mounts suck, they have an inherent design flaw.
Imagine them without the poly, the two metal sides of the mount do not touch, but you could slide them apart. The idea, I think, is they will stretch to a point, and stop.
The problem is the direction of the slide is up/down, and as you know when torque is applied, the left side of the engine wants to twist up, and the right wants to twist down.
I've gone through 3 sets of poly mounts, all warrantied by Schumacher. After the first time, they asked me to make heat shields, which I did. In my case it shouldn't matter because the left mount is in the front, far from the header.
I also have Schumacher headers, and they wouldn't warranty the mounts unless I did. I also have a chain, 2 actually, as there is no torque strap for a BB a-body.
With a tr and a hole in the hood it was obvious when the right mount failed because when opening the hood it would make contact with the carbs on the right side. Engine shows no sign of movement when revving it with the hood open, or when driving it.
The reality is both mounts failed no matter what.
A friend told me he had the same mounts and had no issues. I noted his motor isn't through the hood, so it wouldn't be obvious. A close inspection showed the same as mine.
2 different mounts pictured, both are the left side.
