| Author |
Message |
    
chris hornyak
New member
Username: sagacious
Post Number: 1
Registered: 10-2009
| | Posted on Friday, October 30, 2009 - 08:46 pm: | 
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i have an OMC 5.7 Cobra engine and i have all the numbers off of it. I'd like to know some information on it if anyone can find it. hp/torque rpm band, 4 bolt main, 2 bolt main. year, what it originally came with intake/carb. any chance on knowing what kind of heads? i picked it up yesterday for $50. complete. 140psi on all cylinders. unknown run time.
Front blocking casting number: VO725OAS
OMC model number: 574BPEPWS
OMC Serial number: TO11892O7 |
Bob Hill
Senior Member
Username: boatin_bob
Post Number: 1480
Registered: 07-2006
| | Posted on Friday, October 30, 2009 - 09:59 pm: |
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I can tell you it's a 1990 model that came with a 4 bbl carb. It would have been rated around 260 HP (at the crank). It's also possible it may have had the King Cobra drive on it with thru hull exhausts.
Max RPM would be in the 4200-4600 range. |
chris hornyak
New member
Username: sagacious
Post Number: 2
Registered: 10-2009
| | Posted on Saturday, October 31, 2009 - 12:08 pm: |
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is this a regular rotation motor? my plan for this engine is to put it in my '68 el camino since everything else is standard. im not a fan of the rpm range but im sure its got lots of torque. |
Bob Hill
Senior Member
Username: boatin_bob
Post Number: 1482
Registered: 07-2006
| | Posted on Saturday, October 31, 2009 - 01:45 pm: |
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yes it's regular rotation, they changed the gearing in the outdrive to give them counter rotation. Keep in mind it's a marine engine so the cam in there is going to be similar to a truck. |
chris hornyak
New member
Username: sagacious
Post Number: 3
Registered: 10-2009
| | Posted on Sunday, November 01, 2009 - 06:14 pm: |
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yea i knew about the cam. this is just a daily driver im not looking to blow the doors off. but i am a little concerned, will i be getting worse of better gas mileage with this type of cam? im under the assumption hi torque grunt motors get terrible gas mileage. any thoughts? |
Hy Stat
Senior Member
Username: hystat
Post Number: 1533
Registered: 05-2007
| | Posted on Sunday, November 01, 2009 - 07:05 pm: |
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if it was a raw water cooled engine, it may give you grief in the form of continual rad plugging with sand and rust.
Once a block is used in a open cooling system with lake water in the jackets, it's best kept as that.
At least be prepared to do a lot of rad flushes. |
chris hornyak
Member
Username: sagacious
Post Number: 4
Registered: 10-2009
| | Posted on Monday, November 02, 2009 - 12:49 am: |
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the only other thing i can think of... since this is a one piece rear main seal engine.. is it a factory roller motor? |
RRB
Member
Username: arcrat
Post Number: 75
Registered: 01-2009
| | Posted on Monday, November 16, 2009 - 11:44 am: |
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Flush block real good .... |
