Engine Question

[Tremor Therapy]

My boat has the 496 Mag HO, and I have read many threads regarding supercharging, adding the Raylar kit, etc, and have seen costs from 6k all the way up to 10k for these kits and installations.
I do not recall any thread regarding the Chevy crate racing motors, and a boating application. I was wondering why some of the re-power, or add power guys have not looked into these motors? The particular motor below is 620 hp and 675 lbs torque at a little over 12k.
Any information regarding these motors would be greatly appreciated.
http://www.***boat.com/image_center/data/520/146engine.jpg

[cola]

My boat has the 496 Mag HO, and I have read many threads regarding supercharging, adding the Raylar kit, etc, and have seen costs from 6k all the way up to 10k for these kits and installations.
I do not recall any thread regarding the Chevy crate racing motors, and a boating application. I was wondering why some of the re-power, or add power guys have not looked into these motors? The particular motor below is 620 hp and 675 lbs torque at a little over 12k.
Any information regarding these motors would be greatly appreciated.
http://www.***boat.com/image_center/data/520/146engine.jpg
There has been some talk on that motor. Look around. They are set up tight for marine use & a little high on the comp. ;)
ZZ 572/620HP Technical Notes:
Horsepower 620 @ 5500 RPM
Torque 650 Ft. Lbs. @ 4500 RPM
Max. Recommended RPM 6000 RPM
Compression Ratio 9.6:1
Partial Engine 12499190
Block 25534368 Tall Deck
Bearing Kit, Main 88962212
Bearing Kit, Camshaft 12499434
Crankshaft 88961554 Forged 4340 Steel
Connecting Rod 88962926 Forged 4340 Steel
Bearing Kit, Connecting Rod 88961556
Piston & Pin 88962925 Forged Aluminum
Piston Ring 12499212 Plasma-moly
Camshaft 88961557 Hydraulic roller
Balancer 88962814 SFI Approved
Cylinder Head 12499255 Aluminum
Gasket, Head 88961561
Rocker Covers, pair 12499200 "572"
Valve, Intake 12366987 2.25" Stainless steel
Valve, Exhaust 88963128 1.88" Stainless steel
Valve, Spring 88963934 Dual
Valve, Retainer 12366990 Chrome moly steel
Key, Valve Retainer 12366992
Shim, Valve Spring 88963937
Rocker Arm 12361323 Roller 1.7:1
Lifters 17120060 Roller
Push Rod, Intake 88961559 High performance one piece
Push Rod, Exhaust 88961558 High performance one piece
Oil Pan 10240721
Windage Tray, Oil 88962187
Gasket, Oil Pan 10106407
Oil Pump 88963707
Spark Plug 5613878 - R45XLS
Fuel ...........92 Octane

[prosthogod]

I had the same thoughts. Eliminator did use these in a boat. From what I heard you need to change the cam and add accessory mounts. The guys at Az speed and marine had some outragous price to do so. I think it could be d0one for a few grand. I stopped the process because I looked into ins on the engine swap and it was a 3k increase.My .02

[BADASS38CHEVY]

My boat has the 496 Mag HO, and I have read many threads regarding supercharging, adding the Raylar kit, etc, and have seen costs from 6k all the way up to 10k for these kits and installations.
I do not recall any thread regarding the Chevy crate racing motors, and a boating application. I was wondering why some of the re-power, or add power guys have not looked into these motors? The particular motor below is 620 hp and 675 lbs torque at a little over 12k.
Any information regarding these motors would be greatly appreciated.
http://www.***boat.com/image_center/data/520/146engine.jpg
hi, i have seen for as low as 10,500.00 call around at some dealerships.cam will need to be changed.

[al cole'holic]

I have seen Dana boats putting crate GM motors in their boats before, don't know if they made any internal changes or not...

[78Eliminator]

I would spend just a little more here:
http://www.marineassault.net

[OC-PARTYCAT]

I stopped the process because I looked into ins on the engine swap and it was a 3k increase.My .02
shoulda painted it black, put the merc. hat on it and called it good.
cam will need to be changed
Why does the cam need to be changed? Is it to close the intake before the exhaust?

[Keith E. Sayre]

We have a customer who recently bought that same engine, call me or pm
me if you want his phone number.
As for your questions about why many people haven't done it, my opinion is that most folks are spoiled with the efi systems and don't want to feel like
they've gone backwards and that makes some sense but you always get
an efi system to put on that engine and get it tuned properly. The biggest
reason though for people with newer boats is the cost associated with buying
headers to fit it, pulleys, alternator and power steering pump mounts, water
pumps, etc etc., those parts get expensive and may make it almost as
expensive as getting a Pfaff or Teague motor done with EFI included already? While the Chevrolet crate motor is solid and well built, I would bet
my money that the custom built engine will have superior parts and be assembled better.
I would think that you could sell your 496HO for some good money but remember when you do though that the new buyer will want all of the
accessory parts, exhaust manifolds etc so don't forget to plan for those.
Keith Sayre
Conquest Boats
928-680-1400

[OC-PARTYCAT]

Keith,
If you have a 496, will the efi bolt up to that motor and just tune with a new ecu program?

[ROZ]

I would spend just a little more here:
http://www.marineassault.net
I agree with this one.... Marine Assault 550 CID naturally aspirated engine. $17,500.00... Sounds like a deal to me....