377 mag

[0xDEADBEEF]

I saw an ad for a used Mercuiser 377 Mag. It appears to be a Vortec block with a 383 stroker crank based on what I have read. It has the rare Vortec marine fuel injection intake.

Totally clueless about boat motors. Can I just yank the exhaust manifolds, engine accessories, etc. and drop it in my 96 Tahoe? Will the crank accept a flex plate?

 

[L31MaxExpress]

I saw an ad for a used Mercuiser 377 Mag. It appears to be a Vortec block with a 383 stroker crank based on what I have read. It has the rare Vortec marine fuel injection intake.

Totally clueless about boat motors. Can I just yank the exhaust manifolds, engine accessories, etc. and drop it in my 96 Tahoe? Will the crank accept a flex plate?

The marine blocks are often cracked from freezing. At that point it is a clean, stock L31 block clearenced for the rotating assembly away from being a good engine. Other than that if it has the L31 style distributor it will have a 4x crank sensor on it. Pull the manifolds and accessories and it will bolt right in.

 

[Schurkey]

Lakewater cooling systems often result in massively-corroded internals.

If the cylinder walls get rust-pits from the water-jacket side, you could have real problems.

"I" would want to pop out a couple of core plugs, take a look inside.

 

[0xDEADBEEF]

If I can get it for the right price, I'd be happy with just the crank and the intake manifold. Anything else would be a bonus that I could maybe re-sell.

He's got a video of it running and it sounds fine.

 

[Spareparts]

Lakewater cooling systems often result in massively-corroded internals.

I would have to disagree with that.
Salt and Brackish water will result in heavy corrosion of anything in contact with it.
A Freshwater lake boat engine will outlast any marine gas engine you can find.

 

[0xDEADBEEF]

The engine has 612 hours on it. Did some searching and they say 1 hour is roughly 100 miles in a vehicle. So that would be like a truck engine 61,200 miles on it.

So, question to y'all ... would you pay $2500 for a 377 with a Vortec marine intake? I could swap a 6.0 for $2500, but I really wanted to keep this one pretty close to original. It's way cheaper than the BPE 383 I have been thinking of.

 

[PlayingWithTBI]

It's way cheaper than the BPE 383 I have been thinking of.

yes it is, you simply have to justify the cost of a used motor compared to new

You may not get the performance either.

 

[0xDEADBEEF]

yes it is, you simply have to justify the cost of a used motor compared to new

You may not get the performance either.

Right, it's probably about halfway between just a rebuild and the BPE383. Which is fine.

I'm going to see the man about the horse on Thursday and I'm bringing my compression tester. If it's bad I still may end up buying it after some haggling.

 

[PlayingWithTBI]

I'm going to see the man about the horse on Thursday and I'm bringing my compression tester.

It is enticing to rock that marine setup but...

 

[0xDEADBEEF]

It is enticing to rock that marine setup but...

Yeah, I know. I might be overvaluing it because of the marine intake. MSRP on this engine was $16K! Back in 2008 or whenever.

The NEW 6.2L (377ci) engine includes the engine block, 6.2L Vortec cylinder heads, center-bolt valve covers, a 5-quart marine oil pan, circulation pump, harmonic balancer, roller cam & roller lifters, forged steel crankshaft, heavy-duty rods, forged aluminum pistons, corrosion-resistant black urethane paint, spark plugs, and all internal parts.

Also included:

• 4-bolt main caps
• Rated at 340 hp @ 4500 rpm / 425 lb. ft. @ 3600 rpm (actual power levels may vary, depending on OEM calibration and application)
• Compression Ratio: 9.1:1
• Recommended Fuel: 87 octane
• One-piece rear main seal (also known as a full rear main seal).
• Provision for the mechanical or electric fuel pump.
• Direct replacement for 1996-2016, 5.0L & 5.7L MerCruiser carbureted applications; or MerCruiser 6.2L MPI applications from 2002-2009.
• This 6.2L engine is NOT a replacement for the MerCruiser 350 MAG MPI or Volvo Penta 5.7L MPI engines unless the ECM is properly recalibrated.
• MerCruiser #8M0182232