Small diameter spark plug tubes minimize the possibility of rockerarm to tube contact. These tubes are a direct replacement for your existing tubes. Top and bottom ends are billet aluminum and the tube body is 4130 steel. The steel body will not dent or wear if the rockerarm rubs during operation. The tube diameter allows for an additional .040 of clearance. (O.D. = 1.180). “A minor modification must be made to the spark plug boot to allow the boot to enter the tube”.
Designed Specifically for use with a Billet Noonan Race Engineering Valve Cover ( link for visual Reference http://noonanrace.com/noonan-valve-covers/ )
8 Required for a complete set
Made in America!