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Lincoln 430 engine design differences

Discussion in 'Chris Craft Roamer Yacht' started by raemore, Jul 3, 2010.

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  1. raemore, Jul 3, 2010
    #1
    raemore

    raemore Member

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    some 430's (older?) have the extra riser on the exhaust manifold some do not.
    can anyone shed some light on this???
    otherwise... these are great engines btw.
  2. ILELBOAT, Jul 22, 2010
    #2
    ILELBOAT

    ILELBOAT New Member

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    Riser Hight

    The riser is to keep water out of the engine. when the designer caculated the water line and where the engine sat the hieght required to keep water out is in the hieght of the riser.
  3. raemore, Jul 22, 2010
    #3
    raemore

    raemore Member

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    430 differences

    yes... thanks for the info.
    wasnt sure if the riser had any other functions other than to raise the water level height into the manifold.
    So as far as I can tell all 430 blocks, heads, etc are the same ?
    \alex

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  4. Seafarer, Jul 23, 2010
    #4
    Seafarer

    Seafarer Senior Member

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    That should be true for the marine engines. The MEL didn't change much over its lifetime, except for some displacement increases. The roadgoing engines had manifold changes and piston changes which should not have been reflected in the marinized variants.
  5. P Jardine, Oct 12, 2010
    #5
    P Jardine

    P Jardine New Member

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    There are substantial differences in the years that the MEL 430 engine was produced. The heads, intake manifolds, compression ratios, carburetion, and cooling systems all changed within the 1958-1965 life of the 430.

    The 430HR Chris Craft was the earlier model by CC, the 431 reflected the cooling systems changes that CC did to keep the engine cooler when used in the bigger boats.

    In particular, the intake manifolds and heads do not interchange between years, since the port sizes are different.