[MustangRoadRacer]

to "balance and blueprint" an engine is to take very exacting steps in the building of the engine. meaning all the parts are the exact same size and weight. (balanced). People balance an engine because parts that rotate will not rotate truly if one side of that part is slightly heavier than the other. It will "wobble" to be less than precise. Even in an item, such as the crankshaft, which is supported by bearings along portions of its length, the rotating part will try to wobble and cause excessive bearing wear. So, to prevent this, all the parts are carefully measured, and weighed so that they are all the same and they are all correct.
to "blueprint" an engine simply means to build it to some specification. This could be a factory specification, the specifications of someone’s racing engine or one of the ones listed in a book. In its most basis sense, a blueprinted engine is any engine built to a plan.

I would never laugh at someone simply because they don't understand english unless they are acting stupid otherwise. I can explain it further if you wish, but I chose to keep it simple.