Modifying a standard engine stand with a simple gear reduced slack adjuster.
Using a slack adjuster from a semi air brakes along with the brake camshaft, I modified the engine stand to allow for easy turning of the engine while on the stand. Once you load up a big block on a engine stand it can be difficult to turn the engine. Also there are typically limited adjustment holes to hold the engine in the desired place. This allows you to easily turn the engine and to stop it at any angle with a very easy to turn 22:1 gear reduction in the slack adjuster.
I did this modification several years ago and the video quality is not very good. I think the slack adjuster cost about $16 new and the semi shop that I bought the slack adjuster from gave me some old damaged cams.
This engine stand neck was much larger than the slack adjuster so I used a scrap piece of pipe and sleeved into the neck of the engine stand.