I think it's a Snap-On. I'll need to dig it out of storage, as I haven't used it in a while. It looks identical to the one that's on Ebay. Air power helps out a lot, when someone is doing production work and maybe working on several cylinder heads a day. For a hobbyist, one of the lever action types would be adequate.

Do a quick copy/paste, before the link gets zapped:

https://www.ebay.com/itm/VINTAGE-CLARK-FEATHER-CF-700-PNEUMATIC-VALVE-SPRING-COMPRESSOR/153858128496?hash=item23d2a8ba70:g:UsAAAOSwxdVeZB6H

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
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