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Here is another great forum for engine/drive questions.......http://forums.iboats.com/mercruiser-i-o-inboard-engines-outdrives-21/

I agree.......put in 383 stroker!!

Just curious......what were the compression numbers? Adjoining cylinders?

I don't think you can replace an OMC (w/ the big ribber boot) w/o major transom work.....that's why I would stay away from them all together.

Stay away from the OMC's........

A few bites........didn't catch anything.............

Well?????????? Just got back from fishing and checked this thread.........was hoping to see something........ :hmm

Good luck...........wasn't prying about the price, just wanted to see what my battleship is worth....... :mrgreen:

Curious as to what engine and outdrive is in her...... Was the whole bobtail replaced (engine and outdrive)??? How much is he asking if you don't mind..........:)

It has a 350 w/ Vortec heads and a 4bbl Eddelbrock. I have a 1.5:1 outdrive and turn a 17" prop. Cruise at 30MPH @ 3600RPM's, WOT ~4500 RPM's at ~40MPH. I think it would be underpowered w/ a 305.........

I too am like you more mechanically inclined than with fiberglass. I have replaced my fuel tank and hoses. The floor was solid except for the hatches over the tank areas. Last fall/spring I recored the main hatch........wasn't pretty but it's strong. Plan on doing the other this off season...

Yes.......in order to Decrease RPM's you need to Increase prop pitch and visa versa........... I'm just suggesting that given our weight differences and "similar" engines you will probably need to run a lower pitch pop than me.

Check how many bolts are holding the intake manifold on.....8=Vortec, 12=non-Vortec. Vortec heads will add 30-40HP to a 5.7L SBC, your mech should be able to tell. With the Gulfstream being ~1000lbs heavier than my Offshore I would expect you to be turning a 15" prop.... Sounds like the speed...

I think the boat weighs ~4000lbs. Is the 5.7 a vortec? It would have been upgaded. Also, you might want to check the accuracy of the tach. How was the speed measured.........GPS?

Is that Gulfstream the 23' w/ 9' beam? I have a 24' Offshore w/ a 5.7 w/ a 1.5:1 gear ratio turnin a 17" prop. get 30mph @ 3600 RPM, wot ~4500 RPM going ~40MPH. Hope that helps......

Did you spray the paint? How about the topsides, did you paint that too? What about speed? I have a 350 Mercruiser I/O.......I can cruise comfortably @ 30MPH..........wot ~ 40 MPH.

WOW boat looks great!! Maybe I'm partial............ How long did it take? What kind of paint did you use? How do you like the Lowrance GPS/Sounder

1. '84Offshore 2. Tony 3. 1984 Offshore 3 2005 Remanufactured Mercruiser 350 Mag I/O

Hope to be in by the w/e. Good luck to all for '13..........

241 is probably an I/O........