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pressurizing the cylinder works if a guy can keep the engine from rolling over from the air pressure pushing the piston back down.To keep the engine from turning over the rod has to be perfectly straight up and down in the cylinder.This is sometimes hard to get right on. So you either have to lock the engine with a turning tool on the crank or in gear and the brakes applied.
SO if the piston is down and air pressure is all that is holding the valves up,if you unseat the valve trying to get the spring and retainer back on the valve will drop and fall down in the cylinder.At that point your FUBAR and the head must come off.
The easiest way is to stick a long screw driver in the spark plug hole and turn the engine over until you see it come all the way up and start to go back down.then back it up at the exact up to down point and done.The pistons dome in the K20z3 comes right up in the chamber in the head very close to the valves,so the valve will only drop down a small amount.NO need to mess with pressurizing the cylinder.
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