350 TBI rebuild

Discussion in 'The Garage' started by willyrocket, Aug 5, 2006.

  1. willyrocket

    willyrocket Registered Member

    Mar 8, 2005
    Likes Received:
    Cape Cod, MA.
    Out of a 90 Blazer, RV cam, 30 over, flat top pistons, Question is for eintake. Manifold gaskets from fel pro, After dissassembly, there were two thin metal block off plates in the rear cooling passages (intake). When I install new manifold gaskets, it appears fel pro has taken care of them. Do I still need to install the metal block offs in the manifold?

    Second question, I cant remember where I saw it, but there has been some great reads about a 3 wire o2 sensor for headers using a relay. Anyone point me in the right direction?
  2. dyeager535

    dyeager535 1 ton status Premium Member

    Dec 13, 2000
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    Roy WA
    I'd say search for "AFS-74" threads. Thats the Delco sensor part number you'll want.

    I wouldn't put the blockoffs back in the manifold if the gasket handles them. Does the manifold even have a crossover?

    The TPI manifolds for the most part didn't have a crossover there, but on the Corvettes, GM DID use it. No idea why they wouldn't have just made everything one way, but they didn't.

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