Originally Posted by CenturyUltra

I've got a weiand 177 on a 454 mag in an 88 Formula 242ls. Motor is fresh and just broken in 4 bolt main forged internals 7.75:1 compression inconnel vales in steel heads with blower and carb off an old 525sc. Carb is a 1050 dominator. Boat only runs 62 mph gps with a 25p mirage plus prop at 30 degrees timing and 4800 rpm and 5lbs of boost. . It seems to run very rich the exhaust is getting the swim platform dirty everytime I take it out. I ran it before with a 23p mirage plus and it would turn too high 5500 at ~7lbs of boost but ran ~65 mph. I want to keep a safe tune most importantly but what can I do to increase speed and how fast should it run? More boost more timing? Thanks

Originally Posted by 30ftpanther

88 scarab 30ft. twin 454, mercruiser weiand 177, 6lb. boost,
9.0 to 1 or 9.5 to 1 compression? 850 holley, 29p prop.
27degrees timing, 62mph gps at 3800rpm, rev limiter set at 4700rpm.
Runs a little rich at idle not bad.

dyno 2500rpm 603tq 305hp
dyno 4500rpm 540tq 460hp

hp still climbing at 4500rpm (cam lift .573?)
That makes me feel bad for the bravo1s.
Rev limiter for reentry.

Originally Posted by 30ftpanther

Lunati cam 02006
specs
valve lift .553 .571 (1.7 rocker ratio)
lobe lift .325 .336
adv dur .283 .293
dur @ .050 .236 .246
center line 112* 116*
lobe sep. 114*
rpm range 2700-6700

850 holly jet size 87 & 90

4 years running no top end damage keeping it below 4800rpm.
Went through port motor this year #4 main bearing bad, one lobe on cam .030" wear (flat tappet) valve spring was binding 600+lb. to compress.
Less rpm longer it will last. More rpm more mph. I run 2800-3500rpm all day (ICW).