Engine replacement help…

Ogbign

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The side of the block that isn’t cracked did pop a freeze plug, an it may have spun a rod, a the cam I can see brass on it . Pistons look new tho….
 

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Ogbign

Petty Officer 3rd Class
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76
The side of the block that isn’t cracked did pop a freeze plug, an it may have spun a rod, a the cam I can see brass on it . Pistons look new tho….
 

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Bondo

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I would love to just stick in a v8 there’s a lot more ofem around , I don’t much about fiberglassing tho, I’ve repaired some oilfield tanks but that’s it
Ayuh,.... It ain't that tough to do,.....

Venture up to the restoration forum to learn how to do it,....
 

Lou C

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Agreed, working with wood n 'glass is pretty forgiving and doesn't have to be pretty, it just has to be strong.
I too go back and forth with the stay with V6 vs take that chance to have a V8. I think in my case my 20' is a heavy one, very thick 'glass it weighs in at approx 4200 lbs. So the more I think about it, the more it makes sense to do a 5.7 Vortec, maybe I can...take that opportunity to change the whole works over to Merc. Just gotta sell my better half on the wisdom of the "investment" lol. Well you know dear, outboards cost like $25 grand, this is a bargain lol.
 

Ogbign

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Yours is heavier than mine, mines about 2200-2500 lbs I’m sure if my gears wer different I’d have more power, the 4.3s are good engines to tho, but there’s no replacement for displacement…
 

Scott06

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Agreed, working with wood n 'glass is pretty forgiving and doesn't have to be pretty, it just has to be strong.
I too go back and forth with the stay with V6 vs take that chance to have a V8. I think in my case my 20' is a heavy one, very thick 'glass it weighs in at approx 4200 lbs. So the more I think about it, the more it makes sense to do a 5.7 Vortec, maybe I can...take that opportunity to change the whole works over to Merc. Just gotta sell my better half on the wisdom of the "investment" lol. Well you know dear, outboards cost like $25 grand, this is a bargain lol.
Yes in your size boat if you keep it I would do a 5.7 if it fits in the engine compartment/ doghouse. My boat is similar size, I did a 5.0 because that’s the largest sea ray out in the boat. Knowing what i know now a 5.7 would have been better, same cost and weight 35-40 more hp. The 5.0 works great but would have been worth getting a new upper for the lower ratio Required.
just don’t winterize next fall … will look cheap comparatively
 

Lou C

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This boat was offered with the 5.0 and the engine mount pads are long enough for the V8 already. The the same hull with a different top cap was sold as the Liberator 201 and these were all V8s.
 

nola mike

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This boat was offered with the 5.0 and the engine mount pads are long enough for the V8 already. The the same hull with a different top cap was sold as the Liberator 201 and these were all V8s.
I can say that in my boat, you can really feel the weight of the V6 in the back. A V8 would probably be too much
 

Ogbign

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I can say that in my boat, you can really feel the weight of the V6 in the back. A V8 would probably be too much
I can feel the weight of my v6 also, first time out in it. It stood up I thought water was gonna rush in the back but within seconds it was leveled out an cruising, I still don’t have a gear set for the v6 won’t be hard to find some but I have plenty of room for a v8 , I also know ME . With a v8 I’m gonna constantly buy parts cam, alum heads then il wanna hear it scream, my boat can handle the v8 tho I’m certain, il end up buying two v8s so I can stroke one, you all should just hear my daily driver. I’m a mess an neighborhood probly hates me
 

Ogbign

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I can feel the weight of my v6 also, first time out in it. It stood up I thought water was gonna rush in the back but within seconds it was leveled out an cruising, I still don’t have a gear set for the v6 won’t be hard to find some but I have plenty of room for a v8 , I also know ME . With a v8 I’m gonna constantly buy parts cam, alum heads then il wanna hear it scream, my boat can handle the v8 tho I’m certain, il end up buying two v8s so I can stroke one, you all should just hear my daily driver. I’m a mess an neighborhood probly hates me
I don’t mind running a 5.0 until I build a 5.7 either I can’t find any fiberglassing forums I did watch a few videos
 

Scott06

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This boat was offered with the 5.0 and the engine mount pads are long enough for the V8 already. The the same hull with a different top cap was sold as the Liberator 201 and these were all V8s.
Yes- my Sea Ray 200 was set up nicely at the factory to do either 4.3 or 5.0 hp ranged from 190 hp to 260 hp. Mine was originally the 190 hp 2bbl 4.3 vortec. I realized that it had the same power to weight ratio as my old boat 17 ft/ 3.0 which was under powered. In the end for what we spent the boat works great, just could have had the extra power for the same price, or only the extra cost of a new upper.
 

Scott06

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I can say that in my boat, you can really feel the weight of the V6 in the back. A V8 would probably be too much
On mine Sea Ray did not use risers on the 4.3 version , did put a 3" riser on the 5.0 versions so there must be something to it.

Going from a 3.7 aluminum block to a 4.3 iron block and heads is probably a similar weight gain. Teething issues aside are you happy with it, I mean none of us are able to leave well enough alone, but given that did it work out ok
 

Lou C

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On mine Sea Ray did not use risers on the 4.3 version , did put a 3" riser on the 5.0 versions so there must be something to it.

Going from a 3.7 aluminum block to a 4.3 iron block and heads is probably a similar weight gain. Teething issues aside are you happy with it, I mean none of us are able to leave well enough alone, but given that did it work out ok
Maybe the extra 100-150 lbs of the V8 made it sit a bit lower, I know with the Volvo exhaust I have on mine there is a choice of standard height elbows, and ones that are approx 3" taller. If I go with a V8 I might have to use those, would have to measure first to make sure there's enough clearance. The originals with the V8 used the old style log manifolds not the center riser style of the later models.
 

Scott06

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Maybe the extra 100-150 lbs of the V8 made it sit a bit lower, I know with the Volvo exhaust I have on mine there is a choice of standard height elbows, and ones that are approx 3" taller. If I go with a V8 I might have to use those, would have to measure first to make sure there's enough clearance. The originals with the V8 used the old style log manifolds not the center riser style of the later models.
Yes it does make it sit lower. I found this in the parts book that came with it, the 5.0's had risers listed as 5.0 w RSR.
 

stresspoint

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ha ha , one of the reasons i stayed with the V6 is because i had talk / plans of 500 hp like in my other boat , missus was not impressed :)..
difference was going to be over transoms as well , missus put the foot down there and that was that .
bonus points for me was i now have a boat for family days and a boat for me to hoon and annoy people with .(not that i do as i mostly use it in areas where there is very little boating activity).
V8s in boats can get out of hand very quickly for some of us ,
for that matter ,even my V6 went that way ,but there was the problem of getting performance parts so i was somewhat restricted HP on that is unknown , but it snaps out of the water and does 60 so thats good enough for a family boat IMO.
 
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nola mike

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Going from a 3.7 aluminum block to a 4.3 iron block and heads is probably a similar weight gain. Teething issues aside are you happy with it, I mean none of us are able to leave well enough alone, but given that did it work out ok
Yeah, it's a smoother engine and doesn't feel like it's working as hard, but I expected a much bigger performance gain, both pulling a skier (stern weight for sure) and top end (maybe gained 2 mph). Doesn't seem like enough of a difference between 220 hp at the prop and 170 at the crank. I am still running rich (10-11:1) at wot. Going to rejet when I get a chance, but I can't imagine I'll gain too much. It does feel effortless mid range with a load of people.
 

Lou C

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When I did my top end rebuild I was really just doing an experiment of sorts to see if I could rehab the engine after a bad overheat and subsequent head gasket failure and water in a couple of cyls. Never actually took apart an engine beyond lawnmowers and yard equipment so I figured it would be a fun learning experience. Well, it was and still running it, don't really have a good excuse to upgrade to something else. Now if I could still get a brand new 4.3 that would be something but that opportunity has passed, so if you want new, the 5.7 is about all there is to replace a 4.3. Somehow getting reman via internet businesses doesn't seem like the best plan, I think I'd have to find a local machine shop to build me another, probably could up grade to a balance shaft Vortec unit if staying with the V6.
 

stresspoint

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one thing many people have commented on is how smooth my 4.3 motor is in the high RPM range and it is so crisp when accelerating .

people that have V8 motors in their boats say it is a better engine .
i keep in consideration that those people also have bigger boats than my 18 footer so that is not really a comparison , smoothness and crisp power is very hard to archive with a V8 without spending big and the engine builder knowing the rules when it comes to boat motor builds..

the later 4.3 is IMO the way to go if you can find one that is solid, that is going to be a big problem by the sounds of the market in your area ,so option may just have to be a V8 swap to get this boat back in service..
 

Ogbign

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Apr 16, 2023
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I think I’m gonna stick with the v6 for now atleast, don’t have an engine yet but did order a carb lol edelbrock 1409 I know il need an intake but not 100% sure if it’s gonna be for vortec yet or not . Hopefully it will be
 
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