I putting a 305/700r4 into a 51 desoto. a friend is going to fab custom motor and trans mounts without bushings. will there be alot of vibration in the cab? and should i take the time and money to add bushings. how big of a difference with or without?
Doesn't take much to build a mount with bushings...and you don't need a huge bushing to isolate the engine either. Last swap I did was a V8 into an S10 Blazer 4x4. Used the stock V8 engine brackets and early Landcruiser spring bushings in a tube as the frame mounts. Needed to fab stands to locate the engine properly of course. The bushings fit inside a 1"(ish) round tube...leaves lots of room but not too much flex in a tight engine compartment. Keeps you out of the steering shaft and allows tight clearances for things like exhaust and fan etc... Worked great...no vibes! Also...they will NOT separate like some factory mounts!
The fast A to your Q,is if you don't start the motor ever,it will be smooth. If it an't a race only car,or trailer Qween,Use some rubber,jeees.
If you're using pedestal type mounts, you could always use a hockey puck to help absorb some of the vibrations. They are made from vulcanized rubber and the last pair I bought cost me about $2 each.
http://www.welderseries.com/instructions/c005/c005_install.htm These will let you put the motor where it needs to go, and they're already set up for stock type rubber insulators. There will be quite a difference between solid mounted and insulated mounts. I noticed a difference when I changed out urethane mounts for rubber ones in a daily driver '40.
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