How much "shake" at idle is acceptable?

jos51700 said
I'd take a bottle of windex and individually spray each head pipe. They should all cook that windex off at the same rate. If one gets wet and then dries off, instead of sizzling it off right away, that cylinder is not pulling it's weight.

If it's bouncing header off the Torsion bar, that tends to make me think that the engine mounts aren't up to snuff.

And it's idling a bit too fast.

And the headers are too close to the torsion bars. Any little shake can cause a noise. I agree the mounts could be soft. They may benefit from a shim or washer or two. Sometimes it doesn't take much. As far as the shake? I still think it's fuel mixture during warm up. The op said it runs fine warm.