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I've done the air hold route on two engines doing valve springs and seals...but I would change what you said...air hold should be done at TDC...and car in gear...(manual trans) or block the engine in some manner.
Why? Becasue if when using the valve spring compressor and while digging off the retainers you inadvertantly put too much pressure on the valve stem and it causes a pressure releace the valve could drop out of the head into the cylinder.....at TDC the piston stops in adn you can grab the stem and pull it back up to reseal the pressure......It saved me doing it that way several times.
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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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