2014 4.3 merc water in oil

[Chetmo]

+1 to what Bondo said about a block swap (maybe best to get a built-up long block). If it is any consolation, you may have the distinction of being our first cracked block of the 2018 season. :noidea:

I have about 10 locals freaking out currently...

So I wassss planning to sell this boat. The boat was going up for sale. Now im in a dilemma on my options. If I sell the boat still, im not trying to do anything shady and go about this the best possible way.

Options/choices:
-reman motor (still unsure who to use/contact) for a good option
-4.3 truck block and do the necessary items to swap over
-350 swap. I can get a 350 setup with everything ready to go in the water. my outdrive is (1.62??) I believe, and was told with a prop change I would be ok (just hearsay ..haven't confirmed this yet)

 

[Scott Danforth]

• 350 swap would be a fair amount of fiberglass work to move the mounts. not worth it if your selling
• reman or new long block would get you a waranty
• used motor swap would get the boat moving the least amount of money, however if your selling may affect sale, i would look into a reman or new long block from GM

 

[Chetmo]

I would possibly keep the boat if I did the 350 swap. Also the mechanic pulled my motor out is the one who has the 350 option for me.

 

[porscheguy]

What kind of boat is it?

is the 350 going to be MPI or carb?

depending on how the engine mounts are designed you may not require any fiberglass work.

 

[Chetmo]

Boat is a 2014 Tahoe q5i 19.5 bow rider
unsure on mounts. And unsure on motor details because I wasn’t that interested. But I’ve kinda been thinking out loud here.

 

[porscheguy]

Put in a 4.3 and sell it.

 

[Chetmo]

Casting numbers

GM4.3LG1260234

12557113

timing cover
12591992

 

[Scott Danforth]

heads are 1996 or newer vortec, block is 2003 or newer, however only change to the block is all metric fasteners

 

[Chetmo]

Thank y’all!

 

[TyeeMan]

Go to Mercury Re-Manufacturing. Pick up one of their drop in rebuilds, get a few extra ponies to boot and have fun.

I purchased a boat 2 years ago. A couple years prior the previous owner had the boat on his lift (in northern Minnesota) in the fall, cold front came through and cracked the block.
Original engine was 350/250 h.p. He picks up a Mercury Re-Manufacturing 357 Alpha 4-V. Merc takes a 350 block, bores it .040" over (357 c.i. now) ads a brand new 750 cfm carb and a bunch of other new stuff. 275 h.p of fun right there!!

 

[Chetmo]

We are stuck trying to get an exact swap Longblock. We tried two different ones with no luck. Any idea of a sure set way to get me the appropriate Longblock.

 

[Chetmo]

Just left the gm dealership. I was going to buy a longblock from there. If anything needed changed over we could change it. But I can’t get verification of it will work or not. I just need a solid lead on something that will work as a direct replacement with the computer and all

 

[HT32BSX115]

Just left the gm dealership. I was going to buy a longblock from there. If anything needed changed over we could change it. But I can’t get verification of it will work or not. I just need a solid lead on something that will work as a direct replacement with the computer and all

Since your engine is an EFI engine (Mercruiser mapped MPI) you may have to stick with a Mercrsuiser REMAN or similar.....I am not sure any GM "dealer" could provide the right engine.

If you were going to put a carbureted engine in, you could probably use a wrecking yard Vortec truck engine (with appropriate marine intake, carb, ignition, starter, alt etc)

I would get a reman Mercruiser-type long-block from one of the reputable marine engine rebuilders around the country from if it were me. Preferably local so you can get a local warranty.

 

[TyeeMan]

Probably won't be able to find any better than this. Might as well go with the real deal.

https://www.mercurymarine.com/en/us...ndrive/remanufacturing/pro-series-longblocks/