Jet size

Discussion in 'Holley' started by BillA, Apr 14, 2014.

  1. BillA

    BillA Well-Known Member

    Is there a rule of thumb on difference between primary and secondary jets? The Holley on the car has 73 primaries and 80 secondaries. It's been running rich so I went down to 70 on the primary side and 76 on the secondary. The car has been down for awhile and I want to try to get it right before I fire it up.
     
  2. CameoInvicta

    CameoInvicta Well-Known Member

    There's not really a golden rule. If it was running rich I think dropping 3/4 jet sizes was probably a good step.
     
  3. Tuna

    Tuna Platinum Level Contributor

    Speaking of Holley 4150's, It's usually about 10 sizes smaller on the secondary IF you are running a power valve.
     

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