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It can be cut away with a Dremel tool, hand file, or by sanding it away on a flat surface. Around the bottom edge of the dome is a lip that should also be removed. On the bottom, the tube that is used to guide the piston needs to be completely cut away making the dome unsuitable for future use as a carb part. The internal passages within the insert are large and it is doubtful they would ever become blocked but if need be, the brass plug can be removed with a 3/16″ allen wrench.Īlthough not required for operation, a modified dome can be installed to hide the TBI installation. NOTE: Atop the insert is a 1/8″ brass pipe plug that is used to cap off a drill passage used during machining of the insert. Needless to say keep an eye on the new installation for possible fuel leaks. Typical fuel pressure is 12psi but some have experimented with these injectors near thirty psi. BE SURE THE INJECTOR NOZZLE POINTS TOWARD THE ENGINE! The hose barb accepts a 5/16″ hose and you should try to use fuel injection type hose clamps. No gasket between the insert and the carb body is required. The insert is held in place in the Zenith Stromberg carbs by four stainless steel Philips head screws. Before final tightening, align the injector in whatever direction you desire. Slip the half moon shaped retainer in place (it doesn’t matter which way it faces) and tighten the two button head screws with a 1/8″ Allen wrench. It should stop with the top edge just proud of the aluminum pocket. Once the o-rings are in place and lubricated, insert the injector with a twisting motion.