rpm's
 

a 1995 twin step fountain fever with twin 600's and imco's ....... how many rpm's should it run???

merc 600's?

basically yes but really it is 2 502 merc blocks with 420 b&m blowers 5lbs of boost

hydraulic roller, wouldnt go more than 5600.

solid roller,,,,,,,,,,,listen for clangs and banging noises.

j.k

in either case dont turn em higher than 6000 for extended periods of time as the imcos do not like that kind of r.p.m. the bearings on the prop shaft fail.

your dyno sheet should give you a good idea.