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Cylinder Head question...

Discussion in 'The Garage' started by 84gmcjimmy, Apr 10, 2004.

  1. 84gmcjimmy

    84gmcjimmy 1 ton status

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    What is the difference between oval ports and retangluar ports? Is there an advantage for either one? Thanks 'all
     
  2. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    they are on the big blocks, oval ports are.....well, oval, and rectangular ports are..... retangular /forums/images/graemlins/doah.gif

    im not sure on the performance aspect, but oval seem to be more desirable, for cars though /forums/images/graemlins/dunno.gif
     
  3. Z3PR

    Z3PR Banned

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    [ QUOTE ]
    they are on the big blocks, oval ports are.....well, oval, and rectangular ports are..... retangular /forums/images/graemlins/doah.gif

    im not sure on the performance aspect, but oval seem to be more desirable, for cars though /forums/images/graemlins/dunno.gif

    [/ QUOTE ]Rectangular preform better in the higher RPM band. Oval tend to have better low end torque, or so it seams to me anyways.
     
  4. 84gmcjimmy

    84gmcjimmy 1 ton status

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    So oval would be better offroad because of the low end torque?
     
  5. Blazer1970

    Blazer1970 1/2 ton status

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    [ QUOTE ]
    So oval would be better offroad because of the low end torque?

    [/ QUOTE ]

    Yes, definitely. The smaller oval ports provide for higher intake air velocity at lower RPMs, which improves torque. Rectangular ports (much bigger) are for high rpm operation at the expense of low RPM torque.
     

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