Slick1289

Anyone else running the mercruiser 383 mag? How do you like it? I've only had my boat out twice for a few minutes and so far I love it.

iroc fan

I have the 377 stroker Mercruiser motor if that's what your talking about and I do like it. I call it a 383 all the time though for some reason.

Slick1289

No I'm talking about the 383 mag stroker from Mercruiser. 383 mpi stroker, whatever they call it

PremierPOWER

Have it in a Sea-Ray deck boat. Have about 275 trouble free hours on it in several summers so far.

iroc fan

So what make/model/size of boat do you have this in? I did a little looking on the internet and it appears to be a remanufactured 377 .30 over to a 383 which is producing 350 hp from what iv been reading. It seems like a good motor! Good replacement for a 454 is what I'm reading. This is peaking my interest ...pretty much the same as the 377 I have in my 29 ft Sunsation which still does 60 mph in that size boat! We will say I'm pretty happy! So what do you think of the 383??

PremierPOWER

It’s a 240 Sundeck. The original 5.0L needed rebuilt so I just bought the 383 from mercury instead. It performs much better than the 5.0, but it’s not a performance boat. Just a small lake party boat.

iliveonanisland

A 377 is an under square engine 3.5" stroke and larger bore a 383 is over square 3.75 stroke I'd take the longer stroke tq motor over and under square motor for everything but drag racing. Tq is King on the water

Holy Smokes

iTrader: (2)

Have one on my Cig 20 and love it. Easy start, smooth idle and tons of torque for this hull.

Slick1289

I have one in my 91 240 sport. It was used to replace the 454 and it out performs it all day. Much lighter and more hp than the 454. She hits 70 now

AllDodge

iTrader: (1)

350 = bore 4.0 stroke 3.48
377 = bore 4.0 stroke 3.75
383 = bore 4.030 stroke 3.75
400 = bore 4.125 stroke 3.75

The 377 is a virgin bore 350 with the longer stroke crank and rods. In the old days folks would get the crank and rods from a 400 and install in a 350 that was bored .030