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How to pump up 350 MAGS

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Old 01-05-2009, 09:30 PM
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Default How to pump up 350 MAGS

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

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Old 01-05-2009, 09:39 PM
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Turn them into 383's We did it and got 425hp out of them and you can get more.
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Old 01-05-2009, 09:45 PM
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Thanks bud.... how did you do that... machine shop etc.. or did ya use any supercharges, etc.
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Old 01-05-2009, 09:59 PM
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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.

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Old 01-05-2009, 10:21 PM
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If your boats a 2007 , leave em alone and see if they make it through the warranty , then buy an extended !!!!!
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Old 01-06-2009, 12:19 AM
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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.
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Old 01-06-2009, 08:27 AM
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Thanks guys....all good suggetions! The smartest one is to leave them alone through the warranty though!!! But that's no fun is it....
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Old 01-06-2009, 10:22 AM
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These help
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Old 01-06-2009, 01:35 PM
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JRZ... are those on a 350 MAG? If so, what are they, and where did ya get them...thanks
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Old 01-06-2009, 01:44 PM
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Looks like they are on a scorpion 350 with http://www.custommarine.com/ headers
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