Have a '84 360, am changing out the valve seals in the engine bay since they are shot, but still have good compression on the engine.

Have the thumbwheel valve spring compressor and can get the keepers out on the intake side but cannot get the retainer/or/rotator to push down on the exhaust side, to pop the keepers. Am running 90psi of air in the cylinders and cannot tap the retainer down when the spring is compressed. What gives? I've tapped on it pretty good, but start overcoming the air pressure on the valve... Put some penetrant on the keepers, tapped on the side of the retainer, no luck. Is there a different compressor to use with the rotator or something?

Confused...

THanks for the help!

-Jim