Although isolation mounts are fairly common with 4 stroke engines and pattern aircraft, they are not commonly used with gas engines. They frequently contribute to the failure of exhaust and ignition components on gasoline engine powered aircraft. Their use will usually void all the muffler manufacturer warranties.

The 3w60 should not require an isolation mount. Vibration will be present, but the frequency is substantially different from glow engines, and the P-47 structure should be more than robust enough to carry it.