hi, run # 1 piston to tdc. you can remove springs on # 1 and # 6 same time . with out air pressure or rope. after installing said springs, rotate to # 8 , it and #5 are at tdc, change them both. the valves will drop down some onto piston tops. I change my springs, this way. #1& #6, # 8&#5, #4&#7, #3&#2. follow the firing order. can't miss. there is always two pistons at top same time. one is on firing tdc, other is on overlap.