Engine Using Oil

Discussion in 'Engine Topic' started by Hexafamily, Jan 25, 2012.

  1. Hexafamily

    Hexafamily Veteran Member

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    '72 350 Engine with a 700R4 and 3.73 gears,10,000 miles on a full stock rebuild. The engine appears to be losing oil when it runs a lot of highway miles. We went through 2.5 quarts in 1100 miles, which included four 130 mile trips. PVC valve seems good. Seems to have good compression and it starts and runs well, though the exhaust pipes look mildly black.

    I am concerned that the short trip driving in the first two years of the engine's life did not allow the rings to seat.

    Never had one burn oil like this. Any suggestions?
     
  2. High Country Z

    High Country Z Veteran Member

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    Is the tube on the other valve cover connected to the air filter with a breather element?
     
  3. Hexafamily

    Hexafamily Veteran Member

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    I have a vent tube from the opposite valve cover attached to the air filter.
     
  4. High Country Z

    High Country Z Veteran Member

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    You need to have a breather element inside of the air filter housing for the crankcase ventilation system to work properly, otherwise it may use oil.
     
  5. COPO

    COPO Veteran Member Lifetime Gold Member

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    What multi-grade oil are you using? 10w-30? When you had it rebuilt, did the builder ask you if you wanted the engine built loose like in the 70's or tight like in today's engines. If it's tightly built then it shouldn't use that much oil.
     
  6. fbody_mike

    fbody_mike Veteran Member

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    What kind of baffle are you running under the PCV? A poor or missing baffle will cause excessive oil consumption. I once ran some M/T valve covers without a baffle and darn near fouled all the plugs.
     
  7. High Country Z

    High Country Z Veteran Member

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    Good point, unbaffled valve covers are a no-no.
     
  8. Dave Nelson

    Dave Nelson Veteran Member

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    Pull al your plugs & number what cylinders they came from, post pics of them on here for some opinions.
     
  9. gregs78cam

    gregs78cam Member

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    I agree, check your baffle/position, same thing happened to me until I put baffles in the M/T valve covers. With a HV/HP pump at rpm you could be squirting oil right into the PCV.
     

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