Info on 975sc motor?

[oknozelman]

I'm looking for info on Merc 975sc motor, bore, stroke, what rods, compression, and cam specs? The one i'm looking at is a drysump motor w/ carbs.
Any info or a link would be great thanks

[oknozelman]

Been there no info but thanks:D

[Keith E. Sayre]

Could it be that you mean the 1075SCi Merc Motors?
They also make 850's which are essentially the same but
with less cam and boost etc. Both are twin whippled.
Keith Sayre
Conquest Boats

[oknozelman]

Thanks for the input, the motor I'm looking at is thought to be a 975 sc carb motor that was built by Merc racing. I have looked at what they offer now. I don't know what year this motor was built and was trying to findout what It is w/o taking it apart. It appers tobe fresh. very clean, Rod and mains have little to no wear on them.
Thanks agin Boe

[Beer-30]

Carbed SCs were awhile ago, the 975 number sure doesn't ring a bell.

[Havasu Hangin']

Carbed SCs were awhile ago, the 975 number sure doesn't ring a bell.
The 900's were carbed.
Merc is pretty tight with their recipes.

[Infomaniac]

Thanks for the input, the motor I'm looking at is thought to be a 975 sc carb motor that was built by Merc racing. I have looked at what they offer now. I don't know what year this motor was built and was trying to findout what It is w/o taking it apart. It appers tobe fresh. very clean, Rod and mains have little to no wear on them.
Thanks agin Boe
Dude - put it in your boat and dont mess with it.

[Beer-30]

Maybe it was a "limited" version for poker runners or something where they took a 900 and added some more porting, cam and boost? Or, I seem to recall an old 1200SC (?) that maybe the de-tuned? Just guessing.

[phebus]

Here is an old ad for a boat for sale that had 975's:
I have a 2000 37' Stiletto with 900 Sc's updated to 975's and SSM VI's. Completely redone the boat and just don't have time to use. In So. Cal.
So, yes, sounds like a mod to 900's.

[oknozelman]

Dude - put it in your boat and dont mess with it.
Yesterday 08:38 PM
I am going to put it in just like it is as soon as my blower gets back and get it dynoed to set the Efi.
And I think you guys are right about a 900sc w/ a up grade.
Mercury Mercruiser engines
Gas Sterndrive 850 hp hp900 sc
The HP900 SC Dry–Sump produces an unprecedented 900 crankshaft horsepower. This legendary Poker Run engine features a race-proven ’Dry–Sump’ lubrication system–standard for 2001–resulting in less drag from oil on rotating components, reducing friction and adding horsepower for better overall performance.
Boating Benefits
GM® tall deck bow tie cast-iron cylinder block featuring five main bearings with four-bolt steel main bearing caps.
Specialty components like dual-coil dampened valve springs, solid roller camshaft and lifters, one-piece pushrods, roller rockers, a one-piece tall deck intake manifold, and a Coast Guard-approved fuel system featuring twin 1050cfm Holley® carburetors
Balanced steel crankshaft.
Forged-steel connecting rods and lightweight, aluminum pistons.
Race-prepared aluminum cylinder heads.
Thunderbolt® CD ignition with rev limiter.
High-performance fuel pump.
PCV crankcase ventilation system.
55-amp charging system
Dry-Sump Six drive.
>Exclusive Mercury MerCruiser® service dealer network.
Holley is a registered trademark of Coltec Industries Inc.
*GM is a registered trademark of General Motors Corporation.
http://brucebullockmarine.com/mercury/images/mcSterndriveHP900SC.gif
HP900 SC Specifications
Propshaft Horsepower: 850 (634 kW)
Full Throttle RPM Range: 5800-6000
Displacement (Litre/CID): 8.9/542
Bore (in/mm): 4.44/113
Stroke (in/mm): 4.38/111
Compression Ratio: 8:03:1
Cylinders: V-8
Alternator (amps/watts): 55/776
Ignition Type: Thunderbolt CD
Fuel System: 2 X 1050 CFM 4 Bbl
Fuel Requirements: 92 Posted Octane (R+M)/2 (98 RON)
Drive Unit: Dry-Sump Six w/ Huber 1450 Series
Length (in/mm): 50/1270
Width (in/mm): 39/991 w/ CMI exhaust
Height (in/mm): 37/932
Weight (lbs/kg): 1614/734
Warranty: 90-day limited warranty for recreational boating.
Transmission Ratios Dry Sump Six: 1.24:1, 1.35:1, 1.5:1 or 1.61:1, Left- or right-hand
Standard Features
Dual-coil dampened valve springs
Solid roller camshaft and lifters
One-piece pushrods
One-piece tall deck intake manifold
Coast Guard-approved fuel system
Twin 1050 carburetors
Overspeed limiter
High-performance fuel pump
Available with Dry-Sump Six drive
90-day limited warranty for recreational boat use
Power steering
Remote oil filter
Water/fuel separator
Seawater pump material - composite
Optional Features
Jackshaft (Drive-line and plug-in models available)
Drive available on
Dry-Sump Six
Thanks agin for the feedback

[Beer-30]

If the 900(s) did not come with an intercooler, and your 975 has a chiller installed, that may be the upgrade along with a higher-boost pulley. There is a 75hp Superchiller/pulley upgrade kit for the old carbed 525SC.