For all you guys that have the need to put a jack under the Motor like replacing your timing Belt. Get an old Scissor jack, a piece of plywood around 1' x 2' x 3/4" or whatever you have available, Two 2" x 3/8" bolts, one 3 x 3/8" bolt, one piece of wood around a 2" x 2" x 8" wood. You could get something like a handle to put on one end.
The jack will have 2 holes in the bottom already but if not drill two to secure the jack good. Drill and countersink two hole on one end of the board. There is also one hole on the top if not drill one. Drill and countersink one hole on one side to bolt it to the top of the jack but allow the 2 x 2 to turn easily. With the bolts tightened and the heads countersunk in the wood you are able to slid it under the motor and use a impact wrench or whatever to come up to the desired height and not have to worry about the jack falling over and can be slid easily wherever you need.