This paper attempts to review things considered in design and improvement of valve gear, sometimes overlooked.
Valve seat erosion and contributing influences are discussed briefly. Valve tip and rocker, and valve guide relationships for durability are mentioned, as are push rod peculiarities.
When choice of follower is not limited to either flat or to large spherical radius, some rather interesting possibilities resulting from truly continuous lift-time relationships are described.
Remarks on camshaft manufacture cover both grinding practice and gauging or lack of it.
Finally, while not a part of valve gear, but as a portion of a valve gear component, the geometry of the customary integral oil pump gear, when sink-hobbed (cut without traverse) is briefly treated, and basic means of achieving good results from it are described.
Valve springs are a speciality, and as such have not been mentioned; neither have valve rotators and self adjusting tappets.