Fits BAE 6 or 8 Fathead, Total Flow, Coline and Muscle head cylinder heads that are machined to have the plug tubes stay in the valve covers when removed for engine servicing.
Spark plug tube measures 8.00" end to end. Tubes are 1.250" O.D where they go down in by the rocker arms.
O-rings to fit the tubes are sold individual and separate of the tube.