It depends if your pulling the head off. But I assume your leaving it on the car and are going to do it with filling cylinder with compressed air, right?
Well I have my Snap-on catalog here and only see 3 different ones part number follows# ya3271, vst100, and as posted ya9140a which is the one I would use. Because I dont get how the first 2 work, and the 3rd one works by pivot/compressing spring. and price in my other catalog only show for vst100 which is $39.95.
Go on to Snap-on website
http://www.snapon.com/ and use my part numbers and you'll see what I'm talking about and also you get prices there too.
And if your doing with head off, than I would buy some generic one, its a big c-clamp looking compressor and you dont need a fancy one unless its only like $15-10 difference. Snap-on part numbers for this type are, cf811b, cf19b, cf700b which is air operated. And the difference between first 2 is the jaw size that compresses spring retainer. Then just use magnet to catch the valve keepers so you dont drop them, and be "$hit"
Let us know how it goes for you. My Tomei springs came in still waiting for cam gears and the I'll have to put all those parts to work.
Modified by placham at 4:31 AM 7/9/2009