That's the way I've been assembling Chevy valves for over 50 years. No problem from my point of view! Just be sure the O ring doesn't get dislodged as you release the pressure from the valve spring tool.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!