I have the static balance equipment- - - -it consists of a commercial-grade triple-beam balance scale and some ball bearing support fixtures to weight-match connecting rods. I sublet the dynamic balancing to one of three machine shops I trust to do that work, two of which are owned by former students of mine. I started building precision engines in the mid-1960's, mostly for dirt trackers. Now I'm an opinionated 73-year-old retired geezer who likes to stir the pot on internet forums.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!