Lets see the cam specs. Throwing all the boost in the world aint gonna help if the cam is lame and cant put it to use with the new AFR heads. And for Christs sake, put some fuel in the dam thing! Most people assume adding fuel will kill power, but on a boosted engine, especially marine, you'll find the addition fuel will actually make more power.

Imco performance manifold with risers.

I agree with mild thunder. Your throwing a lot of money at it with no gain. Something must be off. A 509 with 9 psi and afr heads seems like it would be making a good bit of power. I know it's a different boat, but I have a 509 with mild ported stock heads, 741 cam running 6.5 psi with a super chiller spinning a 32p bravo 1 to 5800.

What intake are you running? Maybe I missed that part.

Adding to the lean you have way too much timing as well. I think you need to do a thorough compression test on all holes and go from there. Also we would need more info like cam specs and compression.

First of I don't think you're being a Dick. Second I'm open minded and here seeking help. I'm very Well rounded around race engines as I build my 8 second camaro that makes just shy of 1,250hp to the tire. I'm running meth injection on the boat and therefor 12.6 is still safe. Especially at 6,000ft elevation as the "quality" of air isn't as great as sea level. Plus I want you to read a link here.

http://www.offshoreonly.com/forums/g...ed-motors.html

Stock intake... Smitty who has similar build said 34* is great. He runs m3 12lbs. I don't know cam spec. Does anyone know what Arizona speed and marines comp cam specs are. I'm a thinking it has weird duration split and blowing it out the exhaust. And all cylinders were leak down tested and compression tested. There's not very many hrs on this motor. Now FYI I have heard of a few people that have takin their 60mph N/A boats to Mead and they end up going 71mph and needing to reprop. I repeat Lakes around here are 6,000ft elevation. Strawberry is 9k (thin air) But still boat should be doing better then old combo. I'm thinking prop issue or camshaft issue. But just got a pulley today that should give me 3 more lbs of boost. Someone mentioned that the new prop could not be giving me good transit lift and diving my nose down. I dunno...

You never mentioned your running methanol. Then that changes things . Tryin to run 12.6 afr on 92 octane under boost in a boat scared the crap out of me.

No need to post links for me to read. I've been running blowers on my stuff for a long time, never hurt a piston, valve, or head gasket.

I've played with pro chargers a bit too. I helped my buddy with his M4 inter cooled 522 that made 1162hp on pump gas, no meth, with edelbrock alum heads.

Sorry, thought I mentioned that. Well I started out at 11.7afr 68mph 12.0 70mph 12.6 73 to 72mph. I guess I call Arizona speed and marine and ask for specs. Then hope and prey that's Really the cam that is in this thing. Ugh... I guess I can hook up this 91mm turbo I got laying in my garage. Set boost to 23lbs on top of the m3 on 13lbs and see where I end up... LOL No Really though. I'll runner till she blows. Then build me a 555 and start from scratch. I'm at a loss...

I'd get the cam specs for sure.

Did you determine and eliminate why you blew the head gasket?