Someone want to know what size bolts were needed to bolt a flat head to an HF engine stand.  The stand I have, which is an HF one, will only fit the flat head in one configuration.   Top two bolts are the 5/16 ones and screw into the block.  The bottom two bolts pass thru an existing hole on each side and are held with a nut.  You will need washers under the heads of the bolts to keep them from passing thru the holes on the engine stand arms.