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355 ITB Rebuild

Discussion in '348/355' started by USAF - 1, Nov 9, 2025 at 2:20 PM.

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  1. USAF - 1

    USAF - 1 Karting
    Silver Subscribed

    Mar 27, 2021
    98
    San Jose CA
    Full Name:
    Todd
    #1 USAF - 1, Nov 9, 2025 at 2:20 PM
    In an effort to get this car back in shape, I performed a final smoke leak test before synchronizing the ITBs and discovered that two of the four ITBs have a significant vacuum leak at the throttle linkage. I've seen a few older posts on ITB leaks (which always seem to leak at the throttle linkage), but I haven't found where anyone has rebuilt themselves and the parts needed to do so.

    Has anyone rebuilt them on their own, and if so, what parts are needed? There's nothing in the parts manual showing the parts. If no one has tried, for those who have had them rebuilt, where did you have it done? I'm in the San Francisco Bay Area, but I would ship it anywhere to get it done properly. Thanks!

    Todd
     
  2. SoCal1

    SoCal1 F1 Veteran
    Owner

    Jun 14, 2011
    8,638
    SoCal LA/OC/New Mexico
    Full Name:
    Tim Dee
    #2 SoCal1, Nov 11, 2025 at 5:59 PM
    Last edited: Nov 11, 2025 at 6:08 PM
    I did 2 of mine a while back
    Search for jaguar bushings 355 ITB here on the site

    There was also a company in Phoenix AZ, I believe now gone called z doc or something like that that did most excellent butterfly's if you want to put them or go bigger


    Thats about all I can remember been like 10 years ago


    EDIT
    Here's an old thread on ITB maybe you can go from there and find someone
    https://www.ferrarichat.com/forum/threads/why-has-no-one-else-mounted-throttle-bodies.342739/


     

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