Questions about valve stem seals

just run piston to TDC, starting with #1, no air or rope required!, valve will drop down about 3/16 ". t his way, you can do # 6 same time. # 8 &# 5, same way, #4&7same way, #3 &2 same way. rotate crank in firing order, 1, 8,4,3, job is done.