Re: 7.4L MPI in the 24??
 

What year is your boat?
I would not suggest installing an engine that is older than the boat.

For the same $$ or even a few more $$ a gen VI 454 mag is definitely the way to go. I know someone that dyno'd a gen VI 454 mag carb, 420HP @ 5000rpm. 200 hours is not a lot if the engine has been maintained properly.

I bought my 1999 310HP/7.4MPI with 37 hours for $3200. I would have payed an extra $2000 for a 454 mag if I was not a 2 boat owner at the time.

Upgrade on the exhaust and ECU would be worth about 20HP on a 7.4MPI.

As for my mods to the 7.4MPI, I changed the cam, had some head work done including springs to match the cam, swapped the cast exhaust for stainless marine, and re-calibrated the ECU. Gained 300-350rpm and 3-4mph. I would guess a 45-50HP increase. Still does not have the top end horsepower of a 454 mag, but I would bet it has a lot more low end torque.

Re: 7.4L MPI in the 24??
 

So you would go with the Mag with the higher time?

The 7.4 is a 2002, the Mag is a 1999 which matches the boat year.

The motor is in the classifieds, the guy seems like a fanatic. Which is good.

Re: 7.4L MPI in the 24??
 

For the same money or +$500, I would buy the 454mag.
The difference between 120hours and 200hours does not seem that significant to me being that the engines are stock packages.
In my opinion the 454mag is a better match for the way you have rigged your boat; full hydraulic steering, K-planes...
With the 454mag the boat will top out 6-8mph faster than with a 310HP/7.4, and crack 70 without question.
Good Luck Selling Her, She is an Awesome Looking Boat!

Re: 7.4L MPI in the 24??
 

I'll give it 2 weeks without power, then install a good motor...Mag probably.

Thanks,

Kirk

Re: 7.4L MPI in the 24??
 

Found a 2001 7.4 MPI with less than 30 hours. Now its between the low time 7.4 and the 195 hour 454 Mag.

Which would you install.

Re: 7.4L MPI in the 24??
 

I'd go with the mag, the hours are nothing, it matches the yr and the overall intent of the boat. Someone could add a whipple and have a screamer if they chose to.

Re: 7.4L MPI in the 24??
 

I'd go Mag

Re: 7.4L MPI in the 24??
 

Put Bodyshot's 600hp in it!

Re: 7.4L MPI in the 24??
 

That boat will be easier to sell with a MAG. As a consumer looking to own one in the future I'd have a hard time buying onw with a MPI.