just off dyno
 

just got back from dyno 454 .30 over dart alum. heads dominator 850 carb dual plane air gap only had time for a couple of pulls turned an avrg of 560 lbs of torq and peak hp 575 what do you guy's think it's going in a 28 scarab excel including the platform. boat weighs 4500 lbs lightened it up aprox 500 now4000 how bought a prop any sugestions????

Try a Bravo 1 24p to start

I have the same boat with about the same hP but I got about 75 lb more tork. I am running a 26p prop @ 5400rpm. My boat is loaded with gear and with all the extras it is heavier than when I got it. I would think you should see around 75mph.

what rpm was max HP & tork????

day 2 on dyno
 

just hit it 600 lbs of tourqe and 600 hp I kew a little more tweaking would do the trick ready to rock!!!

MS 28 SCARAB I would try a 26 Bravo or a 24-25 hydromotive. We are going though the same thing now trying to get a 30p Bravo to run at 6000 rpm. with are new Richie Zul motor.

ms 28 scarab
 

Nice numbers on your 454, what cam you running and what comp ratio you pushin??? good job!!!

cam
 

crane cam called saturday night special lift intake 553 exh 571 and duratio intake 236 and exh 246 also looking for exhaust ??? and recomendations??