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CHEVYMILL
05-13-2011, 03:12 AM
Well I found a good deal on a almost new 454 mpi but at u kno only a little over 300 hp any ideas how to bump it up And it's gonna b salt water cooled so no alum

Donzi_Dude
05-13-2011, 09:45 AM
454MPI is over 400HP. 502 is 450HP.

mrfixxall
05-13-2011, 10:17 AM
as far as i know thay make 3 versions..300 hp,330hp and a 385 hp..get a serial # and make sure its not a 300 or a 330..cuz thats about all you can do with those engines..they have weak bottom ends..385 has good forged internals.

Donzi_Dude
05-13-2011, 10:26 AM
http://www.ehow.com/list_7451668_1999-mpi-385hp-engine-specs.html


if its a 7.4MPI you looking @ 300HP.

RedDog
05-13-2011, 10:36 AM
454MPI is over 400HP. 502 is 450HP.

wow - I picked up 35 HP by reading this post. Actually the 502 has 415 HP. The 454 MPI has 385. the 7.4 I think is rated at 330

Mr Fix is correct about internals

Ghost
05-13-2011, 10:54 AM
In the late 90s, I believe both Merc and Volvo rated their low-end fuel-injected 454s at 310 HP. Not sure if anything changed after that.

Donzi_Dude
05-13-2011, 11:21 AM
wow - I picked up 35 HP by reading this post. Actually the 502 has 415 HP. The 454 MPI has 385. the 7.4 I think is rated at 330
Mr Fix is correct about internals


ya, i was talking crankshaft. seems the way to go with boats.

cars its all about RWHP unless your FWD!

the key here is he needs to find if its a 454MPI or a 7.4MPI.

he said 454MPI so i said 400+ @ the cranshaft.

and i dont think you picked up anything but an attitude.

fogducker III
05-13-2011, 11:27 AM
He needs to find out if it is the Mag version of the 454....:)

Donzi_Dude
05-13-2011, 11:31 AM
He needs to find out if it is the Mag version of the 454....:)


the ONLY version of the 454MPI was the mag.


:nilly:

fogducker III
05-13-2011, 11:39 AM
the ONLY version of the 454MPI was the mag.


:nilly:

Read his original post smart a$$...........he states it is a 300hp motor.....he is obviously confused what he is looking at so I suggested finding out for sure if it is a Mag motor, which is 385hp.....I am aware what a MPI 454 is, I am also aware of the EFI version and the carbed versions etc.......:bonk:

Donzi_Dude
05-13-2011, 11:43 AM
Read his original post smart a$$...........he states it is a 300hp motor.....he is obviously confused what he is looking at so I suggested finding out for sure if it is a Mag motor, which is 385hp.....I am aware what a MPI 454 is, I am also aware of the EFI version and the carbed versions etc.......:bonk:


well i guess i mistook that it seemed like he knows its a 454MPI but is confused about the HP...

RedDog
05-13-2011, 12:02 PM
Merc rates their horsepower at the propshaft

Donzi_Dude
05-13-2011, 12:39 PM
Merc rates their horsepower at the propshaft


only after a certain year.

RedDog
05-13-2011, 02:23 PM
only after a certain year.

don't know about that but an MPI would definitely be rated at the propshaft

apparently the change from rating at the crank to rating at the prop occurred in 1992

CHEVYMILL
05-13-2011, 02:37 PM
I belive it's the 330 but really 305hp motor it's a 2004 mpi 454

CHEVYMILL
05-13-2011, 02:41 PM
How can I tell with t serial number

mrfixxall
05-13-2011, 03:19 PM
How can I tell with t serial number


if your intake looks like this then its the good engine that gives you a better foundation for building like install a procharger and remap the pcm and have close to 600 hp..

http://www.rexmar.com/kn/images/kn101.jpg

if you have this with the plastic cover then leave it alone..

http://images.craigslist.org/3md3p63l15W05X25S4b4ca18c3b9a4c8e1a1a.jpg