I had the exact same work done by ASM several years ago and only picked up 4 mph. Didn't think this was too good, so I'm heading in a different direction.

If you still don't find it....MSD has a good troubleshooting section on their Ignition systems.

Have you checked the fuel pressure all the way up to WOT? .

after much troubleshooting the problem was a combination of three things, a map sensor was bad, a pcv valve was stuck open, and i reinstalled all the spark wires and the problem went away. motors are running great but

now brings my next question, iam very unhappy with the performance after the upgrade this is why.

before the upgrade with 1998 tired motors one motor had 90 compression on 2 cylinders the boat ran 72.1 gps full fuel,2 people, spinning 26 hydromotives @5000 rpm wot.

the upgrade was asm, new upgraded crane cam, dart heads, msd ignition, roller rockers, cmi exhaust and a computer reflashing. cost of parts was approx 18,000.00.


heres what the performance is now(it sucks)
between 1/2 and 3/4 fuel,2 people, 26 hydromotives compression is back to 150+ on all cylinders. boat ran 74.4 gps @5000 rpm
water and wind were the same before and after.

the only thing i did not do was change the intake to get more air into the motor. do you guys think this is hindering the new heads and cam from working properly ie creating more hp?

I don't think the intake is what is causing the HP loss. Tyler Crocket does a simmilar upgrade to the factory MPI motors. He gets 100HP more a side by the same means you have went with, only with different components.