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Thread: 94 Chevy 5.7L TBI exhaust flange donut

  1. #1
    Senior Member jbarker's Avatar
    Join Date
    Sep 2009
    New Hampshire

    94 Chevy 5.7L TBI exhaust flange donut

    Pipe-to-manifold is sealed by a donut bushing with a stainless ring inside. The ring on my original fits nicely into the manifold and mikes out at 2.375" OD. The replacement part (Auto Zone), which comes in a bag indicating it is for 83-96 350 CID (seems right), mikes at 2.500 and does not fit. Manifold is original.
    Auto Zone's computer calls out either the 2.5" (which is too big) or a 2-3/32" (which is too small). Any ideas on a source & part number for the correct donut?

  2. #2
    Senior Member
    Kennyray's Avatar
    Join Date
    Oct 2005
    Fort Wayne, IN
    the metal ring is a tight fit. I just replaced mine this morning and I had to tap it into place.

    2008 Silverado LT
    2009 Buick Enclave CX

  3. #3
    Senior Member
    Join Date
    Feb 2009
    Okauchee, WI
    I too had to tap mine ever so slightly into place. The guy at Advance Auto had two different sizes listed, and in stock. I brought with me one old donut to match em up. MMM donutssssss.
    '94 Chevy Silverado Z71
    Xtra cab 4x4 350cid
    4l60e auto

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