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Balancing involves making sure that rotating pieces are very close to the same weight, for example, you would weigh each connecting rod to make sure they are all equal. Very tedious work. Also done to the crank, etc.
Blueprinting involes machining piece to the very edge of the factory blueprints or specs. making everything as perfect as possible, also very time consuming.
Thats my understanding of the process.
I personally would not attempt either of these if you do not have previous experience, mistakes will cost ALOT if you screw up. You will see Showroom stock guys have their motors B&B to get every hp out of the engine without going outside the factory spec. Alot of money for relatively small gains. but in SS, thats what it takes.
Sunbelt did my motors originally, it was several thou to have them built for SS.
As for BMW motor builders, I know someone in Columbus Ohio that owns an independant shop. Alan Jensen is also in Columbus, he did TC's motors for a while, but your talking big dollars. I would get a copy of the roundel and look for some engine shops in there, Korman comes to mind. Does the car your looking at have a bad motor or do you have money burning a hole in your pocket?
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