Hey guys I’ve been into sea-doos and boats a while but this is my first v8 boat

The boat is a motified Deep v I’ve been told 23ft concord hull with a mercury 330hp and has a b&m 250 on it and HiREL EFI system !

I bought the boat off a guy who first ride blew it up , I’m thinking the Ecu was not setup for boost and the motor cold seized a piston in the bore by the sounds of it !

my goal is to rebuild the motor clean up the heads maybe a set of alum heads , not sure on what comp or Cam I will do but I want to use the B&M 250 blower and add the aftercooler to it and I will fabricate a set of jacketed headers for this setup ! Also I will be using the multi port fuel injection with a GM Ecu or megasquirt setup .

what suggestions do you guys suggest on comp ratio and Cam ? Also with these mods would I be able to hit the 650-700hp range !

I was not sure what’s in a 330 one person told me forged but I doubted that !

i was looking at doing a Eagle forged 4340 crank and eagle H beam rods and set of CP,Wiseco or SRP pistons!

is the 330 block and heads same as the mag or 420 ?

Oh those heads are good for torque lol.

i have a 1988 454 gen V block I believe in my RV I’m big out for a Vortec 7400.

i noticed the Mercruiser 330 block has the newer Gen IV timing cover I’m wondering what heads would be on the older RV blocks ?

So I pulled the blower off this 330 and I think someone has been in this thing possibly ? Has small rectangle ports not the peanut ports but I could be wrong I’ll post a pic !

Thanks sent you a PM back.

looks like the lower intake manifold for the blower was or has the injector bungs on it ! They installed injectors and the rails were not straight so two injectors were firing towards the middle of the intake manifold ! I know it’s imposible to fire them into the head port as the blower limits the angle of the injector .