Abstract: An adjustable spark plug boot in accordance with the present invention includes an assembly, a first groove, a first terminal locator chamber, and a second terminal locator chamber. The assembly has first and second ends with a bore extending from the first end to the second end. The assembly includes an elongated section which extends from the first end along a first axis. The first groove extends at least partially around an outer surface of the elongated section and is in a plane which is substantially perpendicular to the first axis. The first terminal locator chamber is located in the bore in the elongated section. The second terminal locator chamber is also located in the bore in the elongated section and adjacent to the first chamber. The first chamber may have a first side which is opposite from the first end and is spaced a first distance from the first end and the second chamber may have a second side which is opposite from the first end and is spaced the first distance from the first groove.