...and the length depends on the engine stand support "standoffs" attached to the arms of the engine stand.
In general, I use 5"--6" bolts, and add washers or spacers (Two or three 1/2" nuts on each standoff--8 or 12 total--works pretty well. Also, you could use 1/2" iron pipe segments cut to length.) as needed to have decent access to the flywheel area. The standoffs welded to the arms of the engine stand are always
at least an inch too short.
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The worst part of this crappy engine stand was having to smoke 'n' grind some extra slot length, so the engine could be installed lower on the mounting flange. If the cam tunnel is approximately the same height as the flange pivot pipe, the engine will be reasonably well-balanced on the stand. 'Course, teaching the Communists the finer part of engine-stand building is not in my job description. I opened up all four slots as far as the too-damn-small flange allowed.
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