Video

This is a 2010 engine, but for the sensors it would be the same as any SBC to LS swap. I used the factory mercruiser sensors and adapted them to the LS block.

@brendandonovan9040 trying to get a video together, but it will hit 57 mph on GPS, which is about a 7mph increase over the 350 that was in it.

@@JohnnyAnderson1 do you plan on putting a cam in it? Wonder what speeds it would hit then.

@brendandonovan9040 Yes, I will definitely be doing a cam swap, looking like a stage 2 truck cam or something with similar specs. My boat is not a "speed" boat hull so honestly 60mph is more than enough top speed in it. I figure I might pick up 2 mlh with a 750 carb and maybe another 5 or 6 with the cam swap. Cruises really good at 40 to 45

@@JohnnyAnderson1 nice that’s awesome and so I could put a 5.3 in any boat with a aplha correct?

@brendandonovan9040 As long as it was a 4.3, 5.0, or 5.7. Technically, it will mount to the 3.0 4cylinder outdrive, but the engine mounts are WAY different from the V6 and V8 stuff.

@m.armstrong53 Depends how heavy, this load would be around 9mpg, towing my 3500lb boat I get around 12. Unloaded on the same roads would be 14.

@@JohnnyAnderson1 how about before the cam?

@@m.armstrong53 no change

@@JohnnyAnderson1 That's kind of a shock to me, so you're telling me that under the same conditions with nothing else changing except for the stock camshaft to the truck Norris camshaft, you experienced a zero mile per gallon loss? Sorry I just wanted to double-check. Thanks!

@m.armstrong53 it really comes down to the efficiency of the engine in comparison to the work its having to perform whenever your dealing fuel mileage. What I did improved the engines ability to make power, so it has to work less under the same conditions. Now if I wanted to drive it hard it would be able to burn more fuel than a stock engine, if I accelerated as slowly as the stock engine did I would even bet it would get better economy than it did stock. Probably not a noticeable difference though. I did headers, and added 799 heads to bump compression 1 point also.

@@dougnorton5143 I changed it

@@JohnnyAnderson1 Sitting long periods is what usually takes those out. Starting the engine even in the winter months will keep it pliable but it is a chore depending on how long your winter is in TN. Probably about the same as here in GA.

@@dougnorton5143 yea very similar to GA

Never tried that but I'd like too

@@JohnnyAnderson1 Try first by sitting on a kneeboard and coming up to speed. GENTLY, place your feet on top of the water and get a feel for the speed. Have a spotter on the boat signal when above 35. Now it's all on you as to when you want to try and stand up but watch a few videos first. The wipeouts can hurt 🤣🤣🤦‍♀🤦‍♀

@dustinhenry8598 Honestly, I have always wondered why boats didn't have transmissions, but since you take off with a 1to1 ratio and prop the boat for max rpm at top speed, there really isnt a need. My boat planes out in less than 3 seconds (probably 2) so a lower gear would not help at all on holeshot. I do know that some of the larger heavier boats do have them. And I could see a benefit if your boat goes 100+ mph it would allow you to cruise at lower speeds.

@@barbwire4879correct

@cantrela no, and honestly, I still haven't got it to work correctly. There are several people who have made the factory switch work, but my shift interrupt switch will not adjust correctly and kits a crap design IMO. As of right now I just have the msd retard hooked up to a toggle switch right now that I flip AFTER I shift to neutral. I have heard I can hook it up to kill one bank of coil ground, which I may try also.

@@JohnnyAnderson1 ya this a problem I haven't seen a clean solution for yet.

@cantrela the cleanest solution would be a bravo outdrive lol. But totally not needed on this small boat and expensive. The volvo outdrives are nice though and shift great

1" and I got the adapter from Amazon

Heads shouldn't have made a huge difference. What gears do you have? Weird, I also had the "throttle hanging" situation, but it was tune related. I believe in the DFCO settings and rolling idle table, may have been something else too.

Ok

Only the prop or gear ratio could change the rpm at a given speed.

Thanks Wayne, I have actually got all the marine grade electronics since testing in this video. The exhaust is a little deciving in the video, but there is no reversion. I'm not sure on the aluminum being an issue but I guess time will tell.

The 4.3 came with a 21 pitch originally, a higher HP engine would need more pitch, not less.

Loved it, ran it with a 4000 stall and it was a blast

@@JohnnyAnderson1 right on. Thanks for getting back to me

Do people dagree cams these days?

Hoping too this weekend weather permitting

Heck yea, slap a 50 on it! lol

I drove it everywhere, sit in traffic fine, slow crusing, highway ect. It was a great cam and wasn't that hard to tune.

Probably a little higher

Your 100% correct, I don't plan on keeping it on there for long. I do wanna keep it for a few more runs because the boat was sitting so long with fuel in it that I tried to clean out, if I have any trouble I'd like to pop the hatch and verify fuel pressure quickly. I actually did have the engine stall out last time I went out and it was fuel pressure related. I agree though, that guage is NOT staying on there.

I only invite people that can swim

@@JohnnyAnderson1 I can float.

So true

Nice, should make a great overnighter. I'd love to have a cabin cruiser about that size, I'd probably go with a 6.0, but man that will be a awesome setup.

@@JohnnyAnderson1 i hope so. I found the boat with the engine blown up and the guy had already pulled it out. So basically I bought a trailer with a free boat...lol. I was thinking a 6.0 or l83. But I also have a 5.7 ls1 laying around I might use. It needs a rebuild.

@HioSSilver1999 yea really any LS or LT would be good, what engine was in it before? The LT would require a different exhaust manifold but there available.

No it idleled perfect from the fort time of cranked it. I'm thinking it was around 20 degree if timing at idle

It's a stock ls1 cam so it should be FSR from having any reversion of water. When I upgrade the cam, I'll have to watch it lol.

The carb setup is so simple, which I love for a boat. But if I had to buy all the carb stuff again, I'm pretty sure I would just go EFI just to save about a grand. With that being said, there is absolutely NOTHING wrong with going carb, I even have the choke removed, and it fires right up perfectly every time.

Dooooo it!!!