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2 Intake manifolds on E-bay

Discussion in '1982-Present GM Diesel' started by Tybee, Aug 14, 2002.

  1. Tybee

    Tybee 1/2 ton status

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  2. 4x4dreamer

    4x4dreamer 1/2 ton status

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    can anyone tell if those are J type? I don't know how to tell the difference. Or even if I'm talking about my A$$
    Thanks...
     
  3. NewK5Guy

    NewK5Guy 1/2 ton status

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    manifold 1 is definately a J. No egr valve in middle of plenum, plus it's the full open plenum style. Manifold 2 is hard to tell with that cap in place. I'd say it is a J as well since I don't see CDR hookups anywhere on the manifold. I could be wrong though.
     
  4. Tybee

    Tybee 1/2 ton status

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    Wish I new what they were called but the 2nd one looks to only have 1 hose hookup on the side. Both my J and C manifolds have 2.
     
  5. arveetek

    arveetek 1/2 ton status

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    Manifold one is a J, but since it is from a Hummer, the air cleaner bolts are swapped 90 degrees. Plus, IIRC, the Hummer intakes are slightly shorter.

    Manifold two is also a J. It only has one CDR hookup because it is a single-plane, undivided plenum style.

    There are two styles of J intakes, the divided plenum, and the open plenum. The divided plenum is, as its name implies, divided in the center. It has a CDR hose hookup on each side of the intake. These were used on pre-88 model engines.

    The other style is completely open.

    Manifold two will bolt right in place of a C code. Manifold one would take some modifications to make work.

    Casey
     
  6. Tybee

    Tybee 1/2 ton status

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    Thankyou
     

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