351 marine engine/351 car engine

Discussion in 'Inboards' started by jrbrailsford, Jun 28, 2010.

  1. jrbrailsford
    Joined: Jun 2010
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    jrbrailsford New Member

    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
     
  2. CDK
    Joined: Aug 2007
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    CDK retired engineer

    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.
     
  3. Jango
    Joined: Aug 2005
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    Jango Senior Enthusiast

    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
     
  4. tuantom
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    tuantom Senior Member

    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.
     
  5. Jango
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    Jango Senior Enthusiast

    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.
     
  6. Fanie
    Joined: Oct 2007
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    Fanie Fanie

    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 :D
    (Ok, I'll admit, I'm a chevy fan :D)
     
  7. troy2000
    Joined: Nov 2009
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    troy2000 Senior Member

    You obviously have no idea what you're talking about, Fanie.

    Ford engines make excellent anchors....:D
     

  8. jrbrailsford
    Joined: Jun 2010
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    jrbrailsford New Member

    Thank you all for the advice
     
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