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Thread: Calculating Carburetor CFM

  1. #11

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    So on the primary, go with 66 or 67 jet. And on the secondary, change the spring and like a 71 or 72 jet, since the original metering plate was like a 69 jet when converted to jet size.

  2. #12
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    Sounds like a good start. A power valve block-off plug is needed for the secondary block, but you might end up with mid 70s in the secondary.
    Regards, Gary

  3. #13

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    On the secondary metering block, there's no hole for a power valve. This is the one for 4150 conversion on 600 4160 vacuum secondary.

  4. #14
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    Ah yes, OK. Then you don't need a plug.
    Regards, Gary

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