• Holley 1920 Floods Coming to a Stop

    After running my vehicle and I turn it off, gas floods over into the intake flooding the engine. Won’t start. Could be fuel pressure – When the engine if shut off there should be some release of pressure. Make sure you have a vented gas tank. After running open the…

  • Holley 1940 Throttle Body Bushing Replacement

    When the Holley 1940 carburetor throttle shaft gets .010 or more of wear, it is time to add bushings to the throttle body. Without a run-out mike this might be difficult to measure, so estimate anything over 1/32″ in sideways action. When the throttle shaft is too loose it will…

  • Testing the Holley 94 Accelerator Circuit

    When I’m rebuilding my carburetors, I will usually test the accelerator pump circuit before closing up the float bowl. The Holley 94 carburetor uses a check ball in the accelerator pump well and I want to make sure it doesn’t need seating. 1st, you need to know why the check…

  • Holley 1931 Carburetor

    The Holley 1931 carburetor is a one barrel downflow type of carburetor. The carburetor is a one piece main body and throttle body casting. The 1969 model had limiter caps installed over the idle mixture screws so that they weren’t tampered with. These can be removed, although I’m not sure…

  • Holley 1904, 1 Barrel Vacuum Check Ball

    Vacuum Check Ball The 1904 carburetors for automatic transmissions have a nylon check ball and retainer clip that goes in the float bowl body where the throttle body mounts to the float bowl. The manual transmissions did not need this. In our Holley kit # K421, this check ball is…