512BB Exhaust Sensor Ports

Discussion in 'Technical Q&A' started by Frank R. Masiarz, May 6, 2015.

  1. Frank R. Masiarz

    Nov 10, 2003
    Full Name:
    Frank R. Masiarz

    Moving a 512BB to high altitude…..over 6,000 feet. Thinking about buying an Innovate air/fuel ratio meter to tune Weber carburetors.

    Anyone know thread size of the ports on the OEM exhaust manifolds. Bosch sensors have M18x1.5 threads.

    Recommendations for jets above that altitude ? A source of jet kits for the 40IFC3 carburetors ??

    Thank you !!

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  3. Ferrari Tech

    Ferrari Tech Formula Junior

    Mar 5, 2010
    Full Name:
    Wade Williams
    The meter should come with a bung that needs to be welded into the collector. You could buy three extra bungs (AAF-ALL34153 Summit Racing) and weld them into each collector. It should also come with one cap for the fitting hole. Buy three more caps too (AAF-ALL34150 Summit Racing). That way you can read and tune all four carbs and then just stash the meter on the shelf for the next time. The part # for Summit is for reference, I am sure you can get the bungs anywhere, maybe even a local exhaust shop that can weld them in also.
    These guys probably have what you want to tune them also.
    Authentic Weber Carbs, Manifolds, Conversion Kits, Accessories and More!

    Now go drive it !!

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