http://www.stovebolt.com/techtips/engines/motor_mount_front/index.htmlQuote from above tech tip
The Rubber Mount
I replaced my soggy original with a rubber repo from one of the major suppliers. It's a drop-in, but wait a minute .... you'd better make sure that you get it oriented properly (slots up) and the required clearances between the bottom housing and the top plate. If you assume that a new rubber insert will bring the clearances back up to snuff, you may be in for some nasty vibrations that won't be evident until you get everything installed and the engine cranked up!!! I found the clamping the assembly in the vise ... to simulate the weight of the 620+ pound engine ... left me with little or no required clearance. The lower "box" had to be dressed down. Evidently, the repo rubber insert was not quite as thick as the original.I used an new original rubber mount with metal inserts purchased from the swap meet section. Repos are all rubber
