Tubes are 6.250" long end to end, under the head to the tip 5.875" and are sold in a pair. Plug tube diameter is 1.265" where it registers in the head and valve cover and the actual tube portion is 1.180" in diameter.
Fits Williams, Moroso, BAE, valve covers using BAE, Manton or T&D rocker arms on BAE, Noonan, Total Flow, MBE cylinder heads.
Tubes can be ordered with small hole to have the spark plug hold the tube in or order with large hole so valve covers can be removed with spark plugs left in the cylinder head.
Racer can choose hole size from drop down menu.