backyard tool has always worked for me.... either use a 13/16 spark plug socket... or if thats too large use a 5/8..... OR after writing below... get a Oxy sensor socket
Using a cut off wheel... remove 2 of the 6 sides of the socket(hex bolts use a 6 sided socket) then use a palm ratchet.
Most of the 4AG valve springs are relatively light - stock 16V springs have a seat pressure of about 35#. Place a balled up rag under the head to keep the valves up. place the socket over the retainer... and push down....... using a magnet to pop the keepers sometimes makes getting the keepers easier
upper right in photo....
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