PFM Twin Turbo carb question

[Marlin455]

Ok. turbo gurus- I picked up a PFM twin intercooled and twin turbo set-up for my jet boat that feeds through a single 4 bbl carb plenum tucked between the turbos- What size carbs were originally installed on these set-ups, and what modifications are necessary, if any? I didn't get a carb with this, and need to know what it will take to feed my 455 and keep it alive. Anyone? Thanks, Stan
http://www.***boat.com/image_center/data/520/6881_12_sb.jpg

[BOOGEYMAN]

Being a drawthrou set up the carb wont need any modifications and a single 850 holley should do the trick.

[FORCEINU]

talk to Jim Louis at Louis Engines Performance in Havasu.
Hes the man if you need a blown or turbocharged motor I think he just dyno
a 540 CI. big block chev. making 1650H.p and 1632Torque.
give him a call 928-680-5974 tell him his brother from another mother referred you hell give you the good guy disc. :cool:

[Marty Gras]

455? That looks like a BBChevy in your picture. Go with an 'annular discharge' 850 Holley. Index the primary powervalve to the 'load side'. You can start with 82 jets and a 2.5 PV in the primaries, and 85 jets with the PV plugged in the secondaries. Run it 'very easily' and check the spark plugs OFTEN. You gave no indication of boost levels, nor internal motor specs, so I just "sent you in the right direction. FUEL and SPARK TIMING will make or break your motor.