I am looking at a couple of older boats both with 454 mag engines but cannot find accurate information on what HP each engine is rated at. The first boat is an 89 with twin 454 mag engines and the second is a 90 with twin 454 engines. Any help or links to a sight that have the information would be appreciated.

Thank you!

if its a carb engine its 365 hp,if the valve covers are finned and with a trs drive could be 420 hp,if it has efi then its 385 hp..

That is what I had thought but recently I have found information that made me question it. I was hoping to find actual mercruiser information.

The early 454mags with Alpha drive packages were 330hp.

I believe that would be 86-87

What boats are we talking about here? It might be easier to look up the original manufacturers engine options, but then again being a 89 or 90 the engines might not be original..... then who knows

[my 454 mag mpi,s are 385 at the prop,


QUOTE=JBA;3913813]I am looking at a couple of older boats both with 454 mag engines but cannot find accurate information on what HP each engine is rated at. The first boat is an 89 with twin 454 mag engines and the second is a 90 with twin 454 engines. Any help or links to a sight that have the information would be appreciated.

Thank you![/QUOTE]

The first boat is a 1990 320 Black Thunder with twin 454 mags and Bravo drives all stock.
The second is a 1989 311 Formula with twin 454 mags and Bravo drives all stock.

Is there any actual Mercrusier information or website that I could look at to see what engines were offered in those general years? I am undecided on what boat to go with and also I am not limited to those two just in case anyone knows of another candidate to look at similar to the two I have already listed.

Those should be the 365hp 454 Mags then and they are rated at 350hp at the prop.

+1