Posible to go from EFI to a carb on a 496 HO mag?
$800 to reflash the computer to help with the smutty black swim platform.
$800 will sure buy a nice carb, sell the ECM and it will pay for a full MSD set up.

Have not looked at the gaskets to see if the EFI intake has the same lay out.

what fuel are you running,,premimum fuel will do that..

Tank full of 87 and it is crazy smutty.

496 head will not take a carb intake see pic CRAP

http://www.offshoreonly.com/classifi...o36335-en.html

i knew that one already you can have one made but by the time converting it all over and you will need a new ignition system also you may as well have it tuned..

You just need to find a dealer or Mercury service tech who can reflash your PCM to a newer calibration. Newer cals are leaner and won't soot as much on your transom.

also check fuel pressure,,,and pressuse regulator

I say leave it efi,

what year and is it a mag or a mag Ho?
I have a couple 555 ecus reflashed by merc with the sooting update from 2003 496 mags ,I would sell you on for half the cost of reflashing yours.

its a 496 MAG HO think its a 03 or 04, has aluminum manifolds
think 05 is when Merc went to cast iron manifolds right?