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Merc 350 MAG MPI 0M300000

Old 02-20-2021, 06:40 PM
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Default 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.

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Old 02-20-2021, 07:06 PM
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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.
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Old 02-20-2021, 08:12 PM
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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.

Last edited by AtomicFrawg; 02-20-2021 at 08:14 PM.
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Old 02-22-2021, 10:19 PM
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Originally Posted by carnutsx2 View Post
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.
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Old 02-23-2021, 12:20 AM
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I stand corrected, I made an assumption that the other versions of the 350 were not installed stock by mercruiser.
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Old 02-23-2021, 07:10 AM
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Originally Posted by carnutsx2 View Post
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.
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Old 02-23-2021, 10:03 AM
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Two piece intakes with plastic top, aluminum bottom are Vortec.
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