ubet28

Well here is the deal i have a 500 hp carbed motor i got fuked on and if i am gonna be pulling it apart i might as well get some more hp out of it.

So i guess what i am wondering is where to start and part #s best place to shop any info that will help out. Goal is 100 to 150 more hp. pocket around 6000 to 7000.
Also if any has any thing to add that i should consider that would be great. Thanks Jeramy

You can see pics of the motor at the link below

http://www.offshoreonly.com/forums/s...d.php?t=193608

Chris Sunkin

Aluminum heads and a custom-grind hydraulic roller cam will put you there. As long as you have the exhaust to support it.

PM RMBUILDER- he can hook you up on the parts and the proper heads. AFR 315 CNC's are probably a good bet on what he'll recommend.

ubet28

Hey Chris you are great guy! I wish i could buy a beer. You have been a great help with this ordeal. The exhaust i have is EMI brand new wll like 10 hrs will this be ok?

blue thunder

How many inches approx from the head does the exhaust gas/water mix with your emis? That has a lot to do with how aggressive you can get with the cam.

BT

KAAMA

iTrader: (1)

yeah to what he says!

Chris Sunkin

The Eddie's are basically Gil copies. They should be dry right to the tips.

Can you confirm that?

As far as the help, glad to. That's the idea of this place- sharing what we've learned. I've been the recipient many times.

BY U BOY

Depends on the risers he got with the EMI's.

Chris Sunkin

I've not seen that many, but all of them I recall had an outlet right at the tip. Now, on a Bravo boat, that might not be that far away. Does EM make a mixer-style tail?

audacity

you can make a solid 575 using the parts that are there and at the same rpm...do not let anyone do the work that can not complete it from start to finish....this includes dyno'n the engine as well.

klaw

had a couple 500 hps done over 3 years ago dynod at 565 each have been turnkey troubly free and I run them hard Ateco in waukegan did them