Hi guys,

Just a general question out of curiosity.

Of what I gather the redline/limit of an engine is governed by the first weakest link which (in most cases?) seems to be the valve-train.

So what would need changing to allow it to rev more?
Obviously valve springs to ensure there is no valve bounce/float, but I see (at least in B series) everyone always mentioning retainers. Are these really prone to fail? How about the valves themselves?

Please note I realize to rev high you need to make power there etc etc. This question is purely from a reliability perspective for the valve-train to sustain higher than stock rpm.

Thanks