i was going through some pics for another thread, and forgot about this hot set-up in valve sealing technology.
this was a set of heads bought from Ebay, with all new parts, fully ported, and "ready to run".

it would have run okay.....but might have used a wee bit of oil.

for those of you not familiar with this type of seal.....the top half is missing. must be they got stuck in the keeper grooves, and were then forced down over the stem.....which just rips them in half.
there is no "sealing" going on with this arrangement.
its more of a "high lube" seal

the white stuff in the keeper grooves is a thick coat of assembly grease.....cuz those keepers really need to be pre-lubed