Hello,do you have a service manual to help set the valves?
CV11-CV12.5-CV13-CV14-CV15-CV16CV430-CV460-CV461-CV462-CV463-CV464-CV465CV490-CV491-CV492-CV493-CV494-CV495-CV460 Command/Pro Vertical Single
Page 134 has some info on cyl head and rockers
it has hydralic lifters
Look over the service manual to see if it helps. It's a free download so you'll have it no matter what.It covers your engine and several others.
it a model cv491s how do i download the manuel
Click on the blue link above: CV
Then save it to your pc.
the manuel was of no help
Ok,let me opt out so someone else can help you.