They make a fitting that screw in to the spark plug hole that will hold the valves up. Cost maybe $10, but will take the worry out of dropping a valve. Make sure the car is out of gear if you have a manual trans because the air will push the cylinder down. You can use a pry type spring compressor. Tap the spring caps with a ball peen hammer to help loosen up the retainers. For a stock motor just aboput any good name brand spring will be fine.
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