496 ho advice

[Icky]

Found a 2002 496 ho forsale with possibly 500 hrs hasn't been scanned yet. Has a stage 2 ecu Anything I should be concerned about.

My second question is who should I bug /pay in havasu to go check it out. Scan and compression test, leak down etc

My 7.4 mpi has been flawless, but......I wanna go faster

 

[Gelcoater]

Found a 2002 496 ho forsale with possibly 500 hrs hasn't been scanned yet. Has a stage 2 ecu Anything I should be concerned about.

My second question is who should I bug /pay in havasu to go check it out. Scan and compression test, leak down etc

My 7.4 mpi has been flawless, but......I wanna go faster

How much?
It may be cheaper to freshen the 7.4?

 

[Steve-o]

I had quality marine do all the same checks for mine before I bought it. 700 hrs and still running flawless

 

[riverroyal]

500 hrs? Hope its cheap

 

[riverroyal]

Found a 2002 496 ho forsale with possibly 500 hrs hasn't been scanned yet. Has a stage 2 ecu Anything I should be concerned about.

My second question is who should I bug /pay in havasu to go check it out. Scan and compression test, leak down etc

My 7.4 mpi has been flawless, but......I wanna go faster

Flat top marine

 

[fishing fool]

I don't think 500hrs is a lot.
Correct me if I'm wrong.... the 496 is a truck motor, how many hrs do you put on your truck a year?? Look at the scan and I'm sure you'll fine 50% are below 1500rpm


Finding a shop this close to desert storm might be hard. I'm a fan of Barrett tho.

 

[Icky]

Then I'd be looking at doing it during the winter.

How much?
It may be cheaper to freshen the 7.4?

Cheap enough to get me off my ass

500 hrs? Hope its cheap

I don't need it dropped in before DS, just someone to check it out. I can drop it in later

I don't think 500hrs is a lot.
Correct me if I'm wrong.... the 496 is a truck motor, how many hrs do you put on your truck a year?? Look at the scan and I'm sure you'll fine 50% are below 1500rpm


Finding a shop this close to desert storm might be hard. I'm a fan of Barrett tho.

 

[jet496]

I don't think 500hrs is a lot.
Correct me if I'm wrong.... the 496 is a truck motor, how many hrs do you put on your truck a year?? Look at the scan and I'm sure you'll fine 50% are below 1500rpm


Finding a shop this close to desert storm might be hard. I'm a fan of Barrett tho.

LMAO. Exactly. I had a friend rebuild his motors at 500 hours or replace them. He didn't even run high RPM's and he was a mechanic. Crazy.

That 496HO is pretty much a brand new motor. I'd take it for a drive & that'll tell you if it's running good or not.

 

[Rbcconst]

Mike a shimmers is very thorough. But if the motor is out of the boat why not rebuild it before you put it in? It’s a bunch of work and money to do the swap. Wait until winter, sell your current motor and rebuild the 496.


Sent from my iPhone using Tapatalk

 

[Singleton]

Found a 2002 496 ho forsale with possibly 500 hrs hasn't been scanned yet. Has a stage 2 ecu Anything I should be concerned about.

My second question is who should I bug /pay in havasu to go check it out. Scan and compression test, leak down etc

My 7.4 mpi has been flawless, but......I wanna go faster

With a ECU stage 2, you are running 91. I find with mine it runs rich, so plugs get replaced every other year and oil every 20-30 hours. Besides that, 500 is nothing on a 2002. I have that on a 2007 motor. Any of the shops in Havasu can test the motors out, but 2 weeks before DS will be hard to find someone with time.

 

[Xring01]

496 HO is a great motor. That will last a long time.

But $$$ spent for the best value in your situation is debateble..

Say you get the 496 for $6000... 425 hp

Or $6000 put into your 454... 500 hp... or more pending your exhaust...

 

[Icky]

Everything I've read about the non mag motor says it's better money spent to swap it out because the bottom end and pistons won't hold. Don't get me wrong I'd love to have 500hp, but I don't see it happening for 6k

496 HO is a great motor. That will last a long time.

But $$$ spent for the best value in your situation is debateble..

Say you get the 496 for $6000... 425 hp

Or $6000 put into your 454... 500 hp... or more pending your exhaust...

 

[LargeOrangeFont]

Everything I've read about the non mag motor says it's better money spent to swap it out because the bottom end and pistons won't hold. Don't get me wrong I'd love to have 500hp, but I don't see it happening for 6k

You can rebuild a working 454 to make 450-500 HP for under $6k.

 

[96motorhead]

You can rebuild a working 454 to make 450-500 HP for under $6k.

What would you change or do to make 500hp with a stock 454?

 

[Runs2rch]

What would you change or do to make 500hp with a stock 454?

Heads, cam, intake manifold, carb, and exhaust. New pistons, rings, and machine work to go with. Your crank, rods, and block will be good.

 

[LargeOrangeFont]

What would you change or do to make 500hp with a stock 454?

450-500 HP out of a 454 is a pretty mild build.

Cam, upgraded valvetrain components, perhaps bore it for a few more cubes, better pistons, rods and crank. Probably better head castings as well. I don’t know what comes on the 7.4 MPI. I also don’t know how good or crappy the 7.4 MPI intake is. That could be a limiting factor.

You don’t need the best of the best parts, it is not a max effort build.

 

[96motorhead]

What do you think bolting on a set of 049 heads, an rpm air gap intake and a 750cfm carb would yield? Keeping everything else stock and knowing that the original heads were the small oval ports.

 

[Xring01]

1hp @ 454 = 454hp,
1hp @ 496 = 496hp,
these are the same as 1hp/350= 350hp...

all are fairly easy to achieve in todays world.

Its easy to go overboard, with expensive heads, and billet parts, custom rods etc etc etc, but that doesnt mean you have to have all that to achieve 450hp 454...

 

[Icky]

But when I turn the key does it run every time?

 

[NicPaus]

I had a 454 MPI. Was told by many it will run forever do not touch it. You want more power buy the 496HO and sell the 454. Better yet a 525 but outdrive will need love.

 

[DWC]

I don't think 500hrs is a lot.
Correct me if I'm wrong.... the 496 is a truck motor, how many hrs do you put on your truck a year?? Look at the scan and I'm sure you'll fine 50% are below 1500rpm


Finding a shop this close to desert storm might be hard. I'm a fan of Barrett tho.

500 hrs on that motor is nothing if it’s been taken care of. One owner with service records / history would be a slam dunk.

 

[LargeOrangeFont]

But when I turn the key does it run every time?

Why wouldn’t it? Your only real issue in keeping it MPI is the tune. That would need to be adjusted in some way for the extra power. I’d explore that option first. If you keep it fuel injected and it is tuned correctly it will fire up and run just like it does today.

Again 500 HP out of a 454 or punch it out to a 468 will not take anything exotic to accomplish. Just pencil out all your known costs beforehand, and see if it makes sense to build it, or go the the 496.

 

[NicPaus]

The 454 MPI is 310 HP. Only thing left to make it 500 HP would be the block.

 

[rvrrun]

But when I turn the key does it run every time?

Where's the fun in that?

 

[Icky]

Where's the fun in that?

Think about this for a minute, you're almost out of beer and you go to fire it up and nothing. Now you have a 2 hr tow with no beer.

 

[rvrrun]

Think about this for a minute, you're almost out of beer and you go to fire it up and nothing. Now you have a 2 hr tow with no beer.

Out of beer? How does that happen?

 

[4Waters]

Out of beer? How does that happen?

Like this.

 

[Icky]

Out of beer? How does that happen?

When your shit won't start

 

[Familyties]

My 2002 496 has 848 hours no problems yet. knock on wood!!!

 

[02HoWaRd26]

May be worth a quick call to BoostPower and ask them about what how and how much to make your 7.4 450-500hp, only real advantage is you spend 6k on 496 you have the 7.4 to sell and recoup some money, but before doing the swap a can rockers and the intake mod by Raylar may be just what you need to really be happy. And then when you sell the 7.4 you’ll recoup the money spent on the Raylar work.

I’m planning on cam rockers and intake mod for sure hopefully the heads too this fall on mine.

 

[Icky]

You should bought that other one for sale and I could've bought yours

May be worth a quick call to BoostPower and ask them about what how and how much to make your 7.4 450-500hp, only real advantage is you spend 6k on 496 you have the 7.4 to sell and recoup some money, but before doing the swap a can rockers and the intake mod by Raylar may be just what you need to really be happy. And then when you sell the 7.4 you’ll recoup the money spent on the Raylar work.

I’m planning on cam rockers and intake mod for sure hopefully the heads too this fall on mine.

 

[LargeOrangeFont]

GM 14097088 refurb rectangle port heads are like $1k for a set and that was just a quick search. That is the same head that is on an HP500.

In the end you’ll probably be into this for more than the 496 swap, but you’ll also make blue motor level power.

Here is an entire $500 HP Long block for under $6k. I’m not saying buy this, but you can build a stout engine for the cash you are talking.


https://m.ebay.com/itm/500-hp-454-gen6-marine-mangus-mercury-racing-mercruiser-/263002397737

 

[02HoWaRd26]

You should bought that other one for sale and I could've bought yours

Best yet I’d have a spare set of headers also....... had that come available sooner i really think i would have but right after dropping 3500$ on mine it was just ..... well bad timing

 

[Jed-O]

GM 14097088 refurb rectangle port heads are like $1k for a set and that was just a quick search. That is the same head that is on an HP500.

In the end you’ll probably be into this for more than the 496 swap, but you’ll also make blue motor level power.

Here is an entire $500 HP Long block for under $6k. I’m not saying buy this, but you can build a stout engine for the cash you are talking.


https://m.ebay.com/itm/500-hp-454-gen6-marine-mangus-mercury-racing-mercruiser-/263002397737

088's are truck heads. I have a set of High performance 990's you can have. They are a little fouled up, but they may be able to be fixed.

 

[LargeOrangeFont]

088's are truck heads. I have a set of High performance 990's you can have. They are a little fouled up, but they may be able to be fixed.

Let the build begin!

 

[Jed-O]

Let the build begin!

There is a hairline crack in one combustion chamber on each head and a couple of broken springs. I'm not sure if the cracks can be fixed. But if you want them they are all yours.
They are also ported.

 

[Icky]

I'm gonna have a motor built before this thread runs it course

Of course you guys are still speaking Chinese to me

 

[LargeOrangeFont]

There is a hairline crack in one combustion chamber on each head and a couple of broken springs. I'm not sure if the cracks can be fixed. But if you want them they are all yours.
They are also ported.

I don’t need them, but the OP could use them perhaps. No idea if they are repairable either.