The oil rings NOT mounted on te expanders will have almost or no tension by themselfs One way to check oil ring tension is to mount them (theoil expander and both rings on the pistons with no other rings and not connected to the rod, buy a fish scale and attach it to the wrist pin and slide the piston into the bore upside down all the way to the bottom of the bore so you can pull the piston out of the bore with the fish scale, watch the scale and see how much tension(in lbs) it takes to move the rings and pistons up the bore (Do several pistons in other bores also ) Let us know what you find out , if you do it BTW, it doesn't hurt to check the oil ring end gap also file as or if needed per the ring makers instruction BTW, rotate the block so the bores are parelel(SP?) to the floor so your not fighting gravity