Remove valve covers first.

Then you have to bring each piston up to TDC. It is best (safest) to use a flywheel Lock, Part Number 116-0140 form Fastlane with the piston being worked on locked at TDC. Pump shop air into the cylinder use a very low pressure, like 30 PSI, if you dont have a flywheel lock and make sure you get the engine as close to TDC as possible otherwise the engine will rotate with the air pressure, and the valves may drop into the cylinder. Belive me, when the valve drops into the cylinder life sucks. Its also best to remove only one plug at a time if you dont have a flywheel lock. You can generally use a compression gauge fitting to attach to your air hose and screw into the head.

Then, remove the rocker arms and rocker guides of both valves for the cylinder being worked on. At this point give the corner of each spring a tap with a rubber mallot to unseat the valve keepers. Now use a spring compressor, making sure the valve does not press down with the valve. Once the valve keepers are clear, remove them with a small screw driver or pocket magnet.

Remove springs and valve seals. Push on new valve seals and reinstall springs and keepers. Repeat this proceedure on each cylinder.

Remove engine lock Reinstall rocker guides and rockers, Install VC gasket and valve cover.

An engine lock makes this save and easy and you can use more shop air pressure to hold the valves.

John Roncallo