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Old 06-28-2010, 03:09 PM
jrbrailsford jrbrailsford is offline
 
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351 marine engine/351 car engine

I have a ford 351 "175" omc engine that is cracked, I was wondering if it does run opposite from a 351 car motor and if I should replace with a marine motor or can I swap parts to a car block and use that? Also, did all the 351 marine motors turn opposite?
Thank you for all your help
Jerry
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Old 06-29-2010, 05:24 AM
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CDK CDK is offline
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To turn the other way around, the engine would need another cam and starter motor. I cannot think of a good reason to do that, but OMC might have thought different about that.

You can acquire a car engine, look at the cams with cylinder 1 in tdc. If they look very different, use the cam shaft and starter motor from your current engine. Of course also adjust the ignition timing.
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Old 06-29-2010, 06:21 AM
Jango Jango is offline
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Unless your OMC engine was part of a twin engine installation, where typically one runs clockwise (RH) and the second CCW (LH) as viewed from the OUTPUT, your engine is most likely a LH, the same as a car or truck. YES, the blocks are the same as the car/truck, regardless of rotation. Internals of marine engines are mostly truck parts. Camshaft could be slightly different in a truck but will work fine. Car camshafts are more "aggresive" and lack the low speed torque necessary in a boat
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Old 06-29-2010, 07:22 AM
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tuantom tuantom is offline
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I'm pretty sure you have a 302 if it's a 175. The 351w was rated at 235 Hp. If you're going by the 351 cast in the heads - both engines used 351w heads for the marine versions in Mercruisers - probably OMC too.
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Old 06-29-2010, 11:36 AM
Jango Jango is offline
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The 302 Intake manifold is just under 9 in. wide. 351 intakes are around 10 in. wide. My 1974, 302 Mercruiser heads have '302' cast - in under the valve covers.
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Old 06-29-2010, 03:16 PM
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Fanie Fanie is offline
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If you get the block number you may get the specifics for that engine, probably online off the internet too.

Oh Oh Oh Oh I see it's a Ford. They don't even qualify for anchors nowadays
(Ok, I'll admit, I'm a chevy fan )
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Old 06-29-2010, 03:53 PM
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troy2000 troy2000 is offline
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Quote:
Originally Posted by Fanie View Post
If you get the block number you may get the specifics for that engine, probably online off the internet too.

Oh Oh Oh Oh I see it's a Ford. They don't even qualify for anchors nowadays
(Ok, I'll admit, I'm a chevy fan )
You obviously have no idea what you're talking about, Fanie.

Ford engines make excellent anchors....
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Old 07-08-2010, 12:38 PM
jrbrailsford jrbrailsford is offline
 
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Thank you all for the advice
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