Thread Maintenance
One of the mandatory steps in maintaining a race car should always be putting a wrench on every bolt before every race, and that includes the carburetor. All you need is a Phillips screwdriver, a straight blade screwdriver, a 5/16 nut driver, and a 1″ wrench. The body, bowl, and block of your Holley carburetor are typically cast moldings of zinc alloy (unless you have billet aluminum pieces) and the threads for each screw must be respected. Torqued is not the goal here, just tight! Healthy gaskets will make the seal just fine so resist the urge to over tighten. Stripped or crossed threads do not have to be a part of your racing experience, and we would like to offer some tips to prevent and/or repair this problem. Below is a list of sizes for every threaded hole in your carburetor; however, the bowl and base plate screws are the only holes that can be helicoiled and all other threads can only be improved by chasing them with the correct tap. Please be mindful of any shavings created and blow out the area with compressed air. Follow the footnotes for more information about certain screws. ¹Bowl screw [...]