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What is the runner length of the ls1 head's intake port?

This is a discussion on What is the runner length of the ls1 head's intake port? within the Internal Engine forums, part of the LSx Technical Help Section category; Has anyone measured it? Also, how does one accurately measure it?...

  1. #1
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    What is the runner length of the ls1 head's intake port?

    Has anyone measured it?

    Also, how does one accurately measure it?

  2. #2
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    So when it comes to measuring:

    - String the backside (long) of the port all the way to the outside of the valve against the port wall.

    - String the frontside (short side) of the port all the way to the inside of the valve against the port wall.

    Then average them?

    So when someone talks about runner length, are they talking about average runner length?

    I have seen that it is said it was CLOSE to 5". Does anyone know exactly what it is and how they got that information?

    Is the intake 10.35" or 15" of runner length. I have seen both posted

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