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    New boat engine swap question 3.0

    I have a 1986 3.0 140 hp engine that runs great no issue at all. I just bought 1998 Monterey 180 with a 3.0 but it has water in the cylinders. I only gave 500.00 for this boat/trailer and I want to swap my other 3.0 into it since the floor and transom is shot in the 1986. My question is can...
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    GM 153ci vs. GM 181ci are they the same block..

    The reason I ask if they are the same block etc. is there are performance cams for the 153ci from comp cams but none for the 181ci. Here is a link to the iron duke cams 153ci the 260 even calls for a a marine application. http://www.compcams.com/catalog/046_047.html I could see getting 15-20...
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    1987 Mark Twain MTB 175 floor replacement etc.

    Well we picked up our first boat last year just happened to be one like I grew up with as a kid. Nostalgia may have got the best of me on this one. I purchased the boat for $1300.00 and put license on it and took her out. We ran it a total of 8 tanks of gas over the summer so now i am pretty...
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    Uncut Vinyl the side of my boat instead of painting.

    Ok well here's my idea buy 24" x whatever it takes vinyl to wrap the top 12-18" of my boat. The have some really trick colors that could really spice it up. What are your guys thoughts on this? The top ring of color around my boat is faded bad and its not coming back ever....
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    Help I need a new prop

    Current setup: 1986 Mark Twain MTB175 3.0l 140hp Mercruiser 1.98 ratio I think Current prop: 13 3/4 x 19 Aluminum 3-Blade (I tried a 14.25x 19 but it just barely touched the tab when I spun the prop) Dry Weight: 2200lbs Speed/RPM @ WOT: 36mph/4500 (no GPS) me by myself. Typical Load: 600#...
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    Rich mixture on cold startup (black smoke)

    Any suggestions its a 1986 3.0 2bl carb choke is set at full clockwise setting. Boat clears up after it has ran for a few minutes. Thanks Steve
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    Free Prop will this work for me...

    OK my brother in law gave me a stainless prop for my 1986 140 I/O the diff. This prop was made for a 4 1/4" gear case and I have a 4 3/4" I did actually install it and the fitment is great except for the portion of the prop that fits into the gear case is obviously smaller about 3/8". Will...
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    Changing props what to expect

    Well got a free prop today its a 3 blade 13 3/4 x 20 SS im going to try and replace my 14" x 19p aluminum with this. What can I expect see as far as differences. The boat is a V-bottom Mark Twain 17.5 I/O 140 merc cruiser weights about 2200lbs. The old aluminum one is pitted and in very rough...
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