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hadleycat

07-19-2013 06:19 AM

7.4 horsepower

I am looking at a 1998 Checkmate the plastic shroud on top of the motor says its a 7.4 MPI. I am trying to figure what horsepower the motor is. Is there a way to tell if it is a mag or not by visual inspection

scarabman

07-19-2013 07:29 AM

There was no "Mag" version of the 7.4 mpi. There were MPI version and TBI versions. It is 454 with cast internals and has 310 HP at the prop

Gladhe8er

07-19-2013 08:30 AM

Wasn't there a 330 HP version of the 7.4L? I thought I had one in my old 22' Scarab.

KCHOTBOAT

07-19-2013 08:38 AM

Quote:

Originally Posted by Gladhe8er (Post 3961433)

Wasn't there a 330 HP version of the 7.4L? I thought I had one in my old 22' Scarab.

Yes the carb version said 330 HP.

GL@PBC

07-19-2013 09:52 AM

7.4mpi= 310hp
7.4mpi/lx=330hp
454mag mpi 385hp

phragle

07-19-2013 10:14 AM

isn't it pretty much 330 at the crank and 310 at the prop for pretty much all the 454 non-mags
??

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