Originally posted by Payntech
Measure from the deck of the piston (Not the top of the dome) to the centerline of of the pin boss.

I would put the piston in and measure the piston to deck hieght.
ok i measured the hieght on the stock k 24 piston and its 1.165 thats what i got but i dont have the best tool in the world...then i measured the rsx piston and i got 1.191 then i saw on the box it was 1.181...stupid me it was writen on the box..lol well i will try to post pic soon..how are you getting the cr #s what formula are youi useing...