Contrary to popular belief you don't want to cool your engines crankcase too much. Things like a cooling flywheel, heat sink back plate and engine mounts can actually degrade engine performance. When fuel is atomized in the carb and flows into your engine, that mixture requires heat to remain properly atomized. If the block is too cool the engine will not run as efficiently. We all know what happens once you get the engine warmed up. Power goes through the roof! Overcooling the block will not get you there.

Many airplane guys use aluminum engine mounts but many of them insert wood spacers to isolate the engine from the mount for just the purpose of not overcooling the block. Vibration is taken care of with soft mounts to the fire wall if anyone was wondering.