Rotating exhaust valves

well learn something new everyday i just went on what i was taught in the engineering applications centre in my collage .....! getting credits for going there rather than the computer centre for programming in fortran 86 seemed like a win to me.

which was all locks should clamp and the 2 parts should not touch. that way the retainer is held on by friction between the lock and the stem caused by the taper in the retainer. therefore grooves/lumps do not carry the load and you wont wear/snap/drop a valve.

based on the posts above i guess that ain't right in all circumstances. !!!
I've been grinding or discarding the little buggers to achieve a space between them when needed, ever since

i'll pay more attention from now on

Dave