454 mag same as 454 MPI????
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454 mag same as 454 MPI????
I am looking at a '99 Velocity 320 with T-454 MPI. They are completely stock other then Stainless Marine exhaust upgrade. Are these the 454's with the forged crank and rods or is this cast junk? Are the MPI's best left as MPI's or would a carb upgrade be valuable?
Last edited by wet_rat; 09-22-2007 at 02:38 AM.
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Is there a 454mpi and a 7.4mpi that are two different beast. I know from what I've read here that the 7.4mpi is crap for upgrades and not much horsepower (310), but that it will also last twice as long before rebuild.
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They have forged internals.
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I guessing you are talking about this boat.
http://www.offshoreonlyclassifieds.c...o17643-en.html
He can call them whatever he wants. If they are not a 454mag MPI's then they are the 7.4 mpi's. Post a pic. BTW if they are not mags, then the internals are cast.
http://www.offshoreonlyclassifieds.c...o17643-en.html
He can call them whatever he wants. If they are not a 454mag MPI's then they are the 7.4 mpi's. Post a pic. BTW if they are not mags, then the internals are cast.
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Here's a list of merc sterndrive engines. Nothing is labeled as a 454MPI.
http://www.mercruiserparts.com/selec....asp?type_id=8
http://www.mercruiserparts.com/selec....asp?type_id=8
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I guessing you are talking about this boat.
http://www.offshoreonlyclassifieds.c...o17643-en.html
He can call them whatever he wants. If they are not a 454mag MPI's then they are the 7.4 mpi's. Post a pic. BTW if they are not mags, then the internals are cast.
http://www.offshoreonlyclassifieds.c...o17643-en.html
He can call them whatever he wants. If they are not a 454mag MPI's then they are the 7.4 mpi's. Post a pic. BTW if they are not mags, then the internals are cast.
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#10
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Here's another example of somebody calling their engines 454 MPI's. Sure they are 454ci, but they are 7.4MPI's as shown in the pic. They have the weaker/cast internals and 310hp.
http://www.offshoreonlyclassifieds.c...o18159-en.html
These are true 454mag MPI's with forged internals and 385hp.
http://www.offshoreonlyclassifieds.c...o15828-en.html
http://www.offshoreonlyclassifieds.c...o18159-en.html
These are true 454mag MPI's with forged internals and 385hp.
http://www.offshoreonlyclassifieds.c...o15828-en.html