excaliber
a well known cam maker mentioned getting the avg. piston speed up to the "magical 4500fpm" range, which would put a 4.10 stroke at around 6600 rpms. i don't know if this has any merit as i don't know what he was basing this on, probably experience as he does a lot of higher performance race stuff. take the cup cars which are turning 8k+ at 3.48 stroke and they are into the 4600fpm range.
also look at the emc winner who has done well the last few years and what they build, longer stroke smaller bore seems to be the tendency i'm thinking, smaller bore also produces less friction.
if you can make a bigger stroke live and breath at higher rpm it will always make more hp, rpm being a mulitplier of tq.
i'm only wrong 50% of the time, so i'm batting .500.
