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
Registered User
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
Registered User
454MPI is over 400HP. 502 is 450HP.
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.
Registered User
http://www.ehow.com/list_7451668_199...ine-specs.html
if its a 7.4MPI you looking @ 300HP.
Merc 502 Mag User
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 330Originally Posted by Donzi_Dude
Mr Fix is correct about internals
RedDog
President - West Vestal Donzi Owner's Group
Knoxville, TN
Gold Member
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.
"I don't have time to get into it, but he went through a lot." -Pulp Fiction
Registered User
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.
Last edited by Donzi_Dude; 05-13-2011 at 10:24 AM.
Paid Subscriber
He needs to find out if it is the Mag version of the 454....
Registered User
He needs to find out if it is the Mag version of the 454....
the ONLY version of the 454MPI was the mag.
Paid Subscriber
Read his original post smart a$$...........he states it is a 300hp motor.....he is obviously confused what he is looking at so I suggested finding out for sure if it is a Mag motor, which is 385hp.....I am aware what a MPI 454 is, I am also aware of the EFI version and the carbed versions etc.......the ONLY version of the 454MPI was the mag.
Registered User
Read his original post smart a$$...........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.......
well i guess i mistook that it seemed like he knows its a 454MPI but is confused about the HP...
Last edited by Donzi_Dude; 05-13-2011 at 10:45 AM.
Merc 502 Mag User
Merc rates their horsepower at the propshaft
RedDog
President - West Vestal Donzi Owner's Group
Knoxville, TN
Registered User
only after a certain year.
Merc 502 Mag User
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
RedDog
President - West Vestal Donzi Owner's Group
Knoxville, TN
Registered User
I belive it's the 330 but really 305hp motor it's a 2004 mpi 454
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