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Since the 670-cfm Avenger we’re running on this combo had never been tweaked, Mena made sure the float levels were where they were supposed to be. To check this without fuel bowl sight plugs (which are found on other Holley models), remove the brass plug with a flat head screwdriver and bump the car until you see a bit of fuel spill out. Upon checking the rear bowl, Mena found the fuel level was low and bumped it up. The float levels are critical for cars with harsh acceleration or for those who often park on steep grades.