I'm looking for ideas on how to gain some more HP from my 350 EFI MAGS.... any thoughts are appreciated.

Turn them into 383's We did it and got 425hp out of them and you can get more.

Thanks bud.... how did you do that... machine shop etc.. or did ya use any supercharges, etc.

Use your block, Scat crank and rods, SRP pistons, Edelbrock RPM Intake and 750 CFM carb, World Sportsman II heads 2.02 intake valves 200 cc runners And A Bullet Racing HYD roller cam Part # CHS 288/296-10HR [email protected] Int 223 Exh 231 Lift Int 530 Exh 548 at a 110 centerline Comp pro mag roller rockers , going through Stainless Marine Exhaust . We put these in a 1987 272 Formula sr-1 . With the 350 mags it would run 54 on gps , after 69.9 on gps. I hope this helps.

Joby

If your boats a 2007 , leave em alone and see if they make it through the warranty , then buy an extended !!!!!

I have done both Prochargers and Whipples on those engines with great success. Either supercharger made near 500 hp. Both the customers and I were very pleased with the end result. There are a few things that need to be done if you want to run over 5 psi. To make 500, it took 7-8 psi, depending on the blower used. Let me know if you have any questions.
Eddie

Thanks guys....all good suggetions! The smartest one is to leave them alone through the warranty though!!! But that's no fun is it....

These help

JRZ... are those on a 350 MAG? If so, what are they, and where did ya get them...thanks

Looks like they are on a scorpion 350 with http://www.custommarine.com/ headers