If you're using all thread rod instead of bolts, you're building a deathtrap- - - -it's grade 2 at best. Ignore anybody who recommends ANYTHING but Grade 8 bolts to hold the engine to the stand- - - -if you think those bolts are expensive, check out the hourly rates at your local emergency room!
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!