The air thing in the spark plug hole will keep the valve from falling into the cylinder when the valve is removed, (a length of nylon rope fed into the spark plug hole works too) but you will still need something to remove the spring.
Here's a good tool for that... It screws onto the stud, and you push the lever down to compress the spring. Once compressed, it locks lock in the down position. I have the exact same tool (only mine is made by Manley) and it works great! I use it all the time. A word of advice. Hit the retainers with a hammer to break them free from the valve locks before breaking them down. The handles rotate around in any direction, and the threaded part that screws down onto the stud flips over to do both 3/8" and 7/16" studs.
It's available from Summit Racing at the below link for $49.95...
http://store.summitracing.com/partdetail.asp?part=9941
Here's the more expensive Moroso unit if you want to spend more money... $75.95
http://store.summitracing.com/partdetail.asp?part=21052
ps. This tool only works on heads with stud mounted rocker arms. It won't work with pedestal style rockers.
Good Luck!
_________________
Mike Burch, 66 mustang real street
302 4-speed 289 heads, 10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
<font size=-1>[ This Message was edited by: n2omike on 6/5/02 8:10am ]</font>