A friend of mine with a possible hydraulic lifter or too, needs to be replaced. I believe he has to remove 1 of the rocker shafts just to replace one of the lifters is that true? Actually what would be the best way to do this without putting a lot of load on the shaft and the other rocker arms. Probably start with say # 1 back those there lifters off then go to # 6? Need a bail out here Bolters.. Thank you......