OMC 245 Engine

[WaterLauger]

I just bought a 1974 Crestliner with an OMC 245 engine/outdrive. The guy who owned this boat didn't winterize the engine so we have a cracked block and heads. Does anyone know what the best replacement is for this engine? The serial number is V0425TBU C9Z189441. How do I find more information on this outdrive - there is plenty written on the OMC 260.<br /><br />WaterLauger

 

[Bondo]

Re: OMC 245 Engine

What IS the 245 ????<br />Is it a Chevy based motor, Or Ford ????<br />Either Way, Find a Truck motor of the same Make,+ Vintage....

 

[WaterLauger]

Re: OMC 245 Engine

Thanks for the reply. This is a Chevy based system. I was thinking of a Napa rebuild (or other equivalent) so that I can have a fresh motor no-one has tweaked. Are there any concerns that I need to be aware of? Is there any difference between the car and boat motors?<br /><br />I called a marine shop and they wanted about a grand for a used engine sitting in their yard. Our local rebuild shops have new units for about $800. What a deal.<br /><br />What do you think? This is my first outdrive boat so I am a little cautious.

 

[Bondo]

Re: OMC 245 Engine

The Absolute Best Deal Anywhere, is the GM Goodwrench 5.7l, 350cid motor for the 1 ton truck..... It's already got a great cam... Just add Brass Freeze-Plugs.....<br />The 2 differences between the "Auto" + "Marine" long Blocks is the Brass frost-plugs,+ the cut of the cam...... A "Truck", or "RV" cam is Very Close to the "Marine" cam.... Virtually the Same...

 

[WaterLauger]

Re: OMC 245 Engine

Thanks for the help, Bondo. I just had a guy offer me a 307 Chevy marine engine with compressions of 130-140 psi for around $900. This thing is all set up for the water so I took it. Hate to spend the extra couple hundred on something like this but at least I will know it works.<br /><br />Thanks again.

 

[MonkeyMate1st]

Re: OMC 245 Engine

Okay, from the OMC Factory tech manual. the 225 hp and the 245 hp are both chevy 307s with deff. cams.<br />compresson should be 165 psi cranking with all spark plugs removed, max deff. between cyls is 20 psi.<br />The 260 hp is a chevy 350. Not knowing what hp your new engine is, you my have to change prop pitch to keep your engine RPMs correct.

 

[WaterLauger]

Re: OMC 245 Engine

That's great advice. Where did you get that tech manual? I had the 245 and changed to the 225. does that answer your question?<br /><br />Thanks for the input....

 

[MonkeyMate1st]

Re: OMC 245 Engine

Keep an eye out on e-bay, boat repair shops going out of buisness will some times sell their tech manuals, that where I got mine. In the back of the manual it give recommentations for the correct prop. But this is just a starting point.