I remember seeing this L tool many years ago.  It is used to depress
the valvesprings when replacing umbrella seals.  You use compressed
air to keep the valves in place and this little lever fastens in place
by the rocker arm stud.  You just lever this L shaped tool over the
top of the springs and use a small magnetic pickup tool to pick the
keepers from the valve stem.  On a Stude V 8 you position the tool on
stud hole between and above the valve springs.  You have to remove the
bolt to get the valve spring out but with a bit of practice you get
the routeen down.  The good news is the tool is easy to make out of a
piece of inch and a quarter flat steel stock.  I cut a slot in the bar
stock with a saws all and drilled a hole at the propper distance for
the bolt and then welded another short 8 inch piece of stock for the
handle.

hartcreek@bentonrea.com (Randall Knapp)Dec 01
=======================
Jim Maxey that does the motor work for the Museum suggests using Ford
Service Parts seals on the Stude V8s.  The seal has a spring around the
valve stem end and under the seal where in fits down over the guide there are
little finger-like protrusions that hold to the guide itself.  I used these 
on my car and have about 10 on the job.  No trbl so far.  The part #'s
 are as follows:
Intake     E7ZZ-6571-A
Exhaust    E7ZZ-6571-B
---------------

91-ish Ford Mustang/Ranger with the 2.3 engine.  These seals grab the valve
guide and fit well on the valve stem and come in a package of 8 for about $2 each
Fel-Pro part number is SS-72683 and it says they fit 7/15/86 thru
1992 140 CI and 302 CI Fords.
=========
valve stem seals on my 62 GT Hawk with the late (86-92) Ford
302 V-8 style seals. These seals are mounted in a brass base and have a small
circular metal spring that helps keep
a good grip on the valve stem.