I used M12x1.75x80 bolts from Lowes, with 1 lock washer on each bolt for a snug fit. My engine stand also adds 2 inches even from the block, so I am unsure if this number would be the same with every engine stand. If your unsure just get some long bolts that are the correct diameter and thread rate, and tons of washer to work out a good fit. I believe they were just shy of 1 inch deep holes on the block (.950) so add that to whatever thickness your engine stand mounts are and get that length bolts. Like I said I used a lockwasher to ensure a snug hold.
