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-   -   Merc 350 MAG MPI 0M300000 (https://www.offshoreonly.com/forums/do-yourself-boating-budget/370477-merc-350-mag-mpi-0m300000.html)

AtomicFrawg 02-20-2021 05:40 PM

Merc 350 MAG MPI 0M300000
 
I have a 2003 Merc 350 MAG MPI 0M300000 Bravo that I am prepping to do head gaskets on. My question is, what automotive engine does this engine cross reference with? (yes I know not use steel head gaskets)

Thanks in advance for any help given.


carnutsx2 02-20-2021 06:06 PM

A chevy 350. What do the valve covers look like, hold down around the parameter or 4 in the middle ( vortex) ?. Vortex were worth 55 hp if I remember correctly but the intake manifolds are different.

AtomicFrawg 02-20-2021 07:12 PM

It has 4 in the middle. It is the 300hp 5.7L vortex. It also has fuel rails on each side of the throttle body and a split intake manifold.
I mainly want to make sure all my ducks are in a row and I can get parts in a pinch at a local autoparts store if need be, before I start tearing into it.

Also depending on year the vortex intakes are different.

RSWORDS 02-22-2021 09:19 PM


Originally Posted by carnutsx2 (Post 4778309)
A chevy 350. What do the valve covers look like, hold down around the parameter or 4 in the middle ( vortex) ?. Vortex were worth 55 hp if I remember correctly but the intake manifolds are different.

4 center bolt valve covers doesn't automatically mean Vortec.

Look for 8 vertical intake manifold bolts. 4 at each end and none in the center. If you don't have that. You dont have a Vortec motor.

carnutsx2 02-22-2021 11:20 PM

I stand corrected, I made an assumption that the other versions of the 350 were not installed stock by mercruiser.

RSWORDS 02-23-2021 06:10 AM


Originally Posted by carnutsx2 (Post 4778626)
I stand corrected, I made an assumption that the other versions of the 350 were not installed stock by mercruiser.

No biggie. Mercruiser made the leap to all Vortec way after GM did.

SB 02-23-2021 09:03 AM

Two piece intakes with plastic top, aluminum bottom are Vortec.


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