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General Mark Twain Discussion / My new Mark
« Last post by ChemKitty on July 04, 2016, 08:09:55 PM »
Thank you for add. I'm looking forward to finding out more about my new boat. Mystery history is right. I'd never heard of this brand before, but I'm excited at the prospect of tooling around with this gem.
General Mark Twain Discussion / Re: New Heads?
« Last post by New2Me78 on June 30, 2016, 06:32:34 PM »
Yeah it has already been converted over to electronic ignition. That would have been just one more thing to fool with year after year. The previous owner put aluminum valve covers on mine so a little polishing & mine should look great & dissipate heat.
Good to hear!  I was going to be surprised if someone managed to make a simple cable really complex by putting a 90-bend in it!
General Mark Twain Discussion / Re: New Heads?
« Last post by Haulnazz15 on June 30, 2016, 09:47:31 AM »
Thanks!  I was able to repaint the factory valve covers which made it pop visually with the new Edelbrock intake manifold.  I'm sure rebuilding the carb will be worthwhile, just for peace of mind.  Since I was going from the factory 2bbl Carter to a 4bbl, I just bought a new Edelbrock marine carb and it was pretty much plug-n-play.  I will be happy to help, the 351W is a great motor and pretty simple to get it set up.  If you are going to be doing anything with the distributor, I highly recommend the Pertronix setup, as it eliminates the points (a wear item) in lieu of an electronic sensor. 
General Mark Twain Discussion / Re: New Heads?
« Last post by New2Me78 on June 29, 2016, 06:57:45 PM »
Wow! that looks great! I went ahead & ordered the long block today. While I wait on it I have a lot more work & money to spend. Still have some interior work to do, order a water pump, rebuild that Holly 4bbl carb., on & on the list goes. A little nervous about rebuilding the carb. I haven't done one like that since the late 80's but since it has sat for so long I imagine it needs it. The floats sound free but I think there is leather pumps in there that can get dried out over time. Thanks again for all of your info. I am sure I will have more questions before this projects over. :)
Thank you for the reply.
Yep your right athe standard teleflex cable works.
The confusion was that when.the cable broke the throttle was in the forward position. So when I pulled it back to neutral it put a perfect 90 degree bend in the cable.  It looked so stock that fulled not only me but two different marinas that I took the cable to. 
New cable is on and all is well.

General Mark Twain Discussion / Re: New Heads?
« Last post by Haulnazz15 on June 29, 2016, 09:37:34 AM »
Just for a reference, here's what I was dealing with:

Engine rear w/shift plate:

Engine installed, but top cap of the hull still separated to provide a lot of space over the carb to maneuver engine into bilge:

General Mark Twain Discussion / Re: New Heads?
« Last post by Haulnazz15 on June 29, 2016, 12:05:08 AM »
We both are running the 351W, however you have the OMC drive, where mine is a Mercruiser model.  I'm not too familiar with the stringer drive setup you have.  The Merc out drive is removed entirely, so there's nothing to support, the OMC unit it a different animal with the large flexible seal which could be more susceptible to damage if left unsupported.  I do believe that set screw is just for minor alignment adjustments, but I doubt it's of vital consequence.  It may just be for helping get the block-mounted portion to line up with the stringer-mount post.

I've not used, but I got mine from Rapido Marine and it was fine.  The only think I learned after some fussing with water trials is to make sure you check all of the ports on the front/back of the engine heads.  We chased down some exhaust leak noises thinking it was coming from the exhaust gaskets (pulled the manifolds twice) only to find that the block had open exhaust ports on the back of the heads (against the transom) which needed threaded plugs inserted to block off the holes.  Quick and easy fix once found, and those ports are only used on auto 351W's for the EGR system, so we never bothered to look at the back of the heads when dressing out the engine.
General Mark Twain Discussion / Re: New Heads?
« Last post by New2Me78 on June 28, 2016, 08:11:03 PM »
Did you have the outdrive supported when you pulled the motor? I think I have got just about everything unhooked that I need to. Getting ready to order an engine from "marineengines4less." They have an A+ rating from BBB & mostly positive reviews everywhere I've searched. $2,200 for a long block shipped. Don't know if you can help me with this or not (think your engine was a SB Chevy) firing order on my 351W is 13726548 which I have been told is standard rotation.
Pics I have enclosed are of the back mounts holding on the outdrive. I have had mixed comments from iboats forum that I HAVE to remove the outdrive before I remove the engine. With some supports under it back by the prop it appears to me that I could pull the engine out without outdrive removal.
Also included a picture of a set screw that is on both motor mounts. Do you know what these are for? Engine alignment?
The throttle cable should just be a standard Teleflex cable.  You'd need to measure it to make sure you have the correct length, though.
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