305 SBC upgrades
#11
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Joined: Jun 2004
Posts: 1,949
Likes: 37
From: Omaha, Nebraska. Boat on the Mighty Mo! Longest river in the USA!
Here is a link for a brand new engine. 
http://www.1800runsnew.com/newbase-details-NLM.html
One also posted in Swamp Shop yesterday. This is a good deal.
http://www.offshoreonly.com/forums/s...lock-sale.html

http://www.1800runsnew.com/newbase-details-NLM.html
One also posted in Swamp Shop yesterday. This is a good deal.
http://www.offshoreonly.com/forums/s...lock-sale.html
Last edited by 1BIGJIM; 11-15-2013 at 07:01 AM.
#12
What do you guys think of one of these? http://www.ebay.com/itm/Mercruiser-V...dc88b2&vxp=mtr
#13
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Joined: Nov 2006
Posts: 1,313
Likes: 153
From: Tygart Lake, WV
I agree. Stay away from the Ebay remans unless they are from a reputable engine builder. I broke a GM forged crank in a 355 solid roller engine years back and replaced the shortblock with a Jasper Marine shortblock to get back on the water in mid July. It was a .060 over 2 bolt 010 block with stock rods, pistons, crank etc.. It was assembled correctly and I put 367 hrs on it spinning different combos from 5200-5800 Rpms. It currently is a spare in the garage.
#14
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Joined: Sep 2008
Posts: 916
Likes: 41
From: Tampa Bay Area Florida/ North Miami Florida
#16
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Joined: Apr 2005
Posts: 2,998
Likes: 127
From: Lees Summit ~ LOTO 10MM
Do yourself a favor..... Enjoy the boat for what it is. If you really want to gain speed or handling which you have indicated, save yourself the frustration and buy a boat that has your desired level of each. You will be money and stress ahead in the end. This is fact.
Good luck
Good luck
#17
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Joined: Feb 2011
Posts: 2,640
Likes: 4
Do yourself a favor..... Enjoy the boat for what it is. If you really want to gain speed or handling which you have indicated, save yourself the frustration and buy a boat that has your desired level of each. You will be money and stress ahead in the end. This is fact.
Good luck
Good luck
Lots of good deals out there on used boats, and the value of our older boats is not keeping pace enough to justify spending a lot of money on engine mods - unless that is just your kind of thing. Just good to know that going into it. You will not likely get much if any of the money you invest back when it is time to sell.
#18
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Joined: Feb 2012
Posts: 4,031
Likes: 10
From: westville, NJ
Lots of good deals out there on used boats, and the value of our older boats is not keeping pace enough to justify spending a lot of money on engine mods - unless that is just your kind of thing. Just good to know that going into it. You will not likely get much if any of the money you invest back when it is time to sell.[/QUOTE]
all the more reason to get a diff engine to play with. throw the 305 beck in it when you realize it ain't gonna go faster enough. find something faster with a bad engine...
all the more reason to get a diff engine to play with. throw the 305 beck in it when you realize it ain't gonna go faster enough. find something faster with a bad engine...
#19
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Joined: Sep 2011
Posts: 557
Likes: 4
From: Fox Island, WA
When I was messing with the 350s in my Chris Craft Stinger the best mod I did was to replace the stock lo-rise intakes with a high rise Z-28 iron intakes. I picked up 400 r.p.m.s and a lot of torque.
If you are fresh water cooled or only operate in fresh water you might get away with an aluminum version of the same. It would probaby cut 25 pounds (each). I did make additional gains with heads, cams,
and roller rockers but it was a huge expense times two motors for about 5 m.p.h. gain. I also had to buy new props. Before I'd go to that expense again I would shop for a faster boat as others have
suggested. Good luck!
If you are fresh water cooled or only operate in fresh water you might get away with an aluminum version of the same. It would probaby cut 25 pounds (each). I did make additional gains with heads, cams,
and roller rockers but it was a huge expense times two motors for about 5 m.p.h. gain. I also had to buy new props. Before I'd go to that expense again I would shop for a faster boat as others have
suggested. Good luck!



