jreynolds
New Member
Hello, I am having issues finding the correct spark plug tubes to fit a 68 road runner 426. I have tried the normal spark plug tubes and they are too short. Cannot torque the spark plug without it flaring out the bottom of the tube. From the lip on the valve cover to the spark plug hole it measures 6 1/4". I have attached a picture of the valve covers. Does anyone have any suggestions as to what tubes to purchase or something I am just missing? Thanks in advance!