A question on locating and replacing Plymouth Floating Power Engine Mounts recently came in the comments section which inspired this article. Plymouth Floating Power Engine Mounts were used starting in the 30’s with Plymouth ads boasting that a glass of water on the fender would be steady during idling and high rpm of the engine due to the state of balance created by the Floating Power mount system:

The front engine single mount was up high on the engine just under the water pump while the two engine rear mounts were mounted low and close together near the transmission.  If you have this style of mount on your Plymouth (or other Chrysler product) it’s best to make sure the rubber has not separated from the metal or torn to avoid serious issues.

Later Plymouth moved to a more cost effective front mounts mounted down low on each side rail as illustrated in the 59 Plymouth Owner Manual:

The V8 is shown to have a pair of front “Spool” type mounts while the 6 cylinder has sandwich style mounts. A pair of mounts in the front wedge the front part of the motor more firmly than the older style “Floating Power” mounting system. Bet the V8 larger power output demanded a firmer mount to hang onto all that power!!!!

I have managed to put a “Floating Power” Engine Mount on a 59 Plymouth L head to install it directly into a 1935 Dodge Truck so at least with the L head 6 cylinder it’s possible to interchange mount styles when relocating an engine.

After 1959 I believe most 6 cylinders were “Slant Sixes”. I wonder if a “Floating Power” engine mount could go on one of those if you needed to transplant it into an early chassis? I suspect the odds are low since the water pump is located  down low and off center so the space for the center high mount might not be easily found.