Hey does anyone know how to upgrade the 600Sci's to gain some more HP? I was thinking about possibly ordering the 700's blower pully, ecu, & intercooler. Do anyone know if that is the only thing that is changed? Does anyone know what is the max boost pressure we can run on that motor?

Thanks
-Rob

gto,
The cam profile is very different between the 600 SCi and the 700 SCi.
Regards,
Bob

ok so it looks like i would need an ecu, pully, camshaft, & larger intercooler. Does anyone have an idea where to get these parts? I could order them from mercury but i would need a 700sci serial number. Thanks- Rob

You would probably be much better off to sell the 600sci's and build some custom power if you want 700hp.

I agree with Griff on this one.

I have a friend with a 600SCI in a 30' Super. He has researched all avenues to turn his 600 into a 700. The ecu and other parts from Merc are big big $$. You can replace the ignition and computer system with MEFI 4 but then you lose the smart craft.

alright thanks guys, guess will just have to wait and do the complete engine and drive job when they finally quit. Appreciate everyones advice. -Rob

From what I have heard, the Mercury 600's dyno well over 650HP...

You guys give up to easy. I bet by spring someone will be able to get around the system.

Hey Zup,
For sure you can get around/replace the system and turn up the boost on a 600SCI. There are lots of Whippled 502EFIs making 700+HP.
I'm quite sure that AZ Speed, Precision EFI, Tyler Crockett, and other builders could provide a new ignition, harness, and MEFI 4 ecu ready to go.
The problem is, you would have to be willing to loose the Merc Smart Craft.