Tubes are 7.200" long end to end, under the head to the tip 6.915" and are sold separate. Plug tube diameter is 1.255" 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 Noonan cylinder heads.
Plug tubes are open bottom which allow the racer to pull the valve covers off without pulling the spark plugs out of the cylinder heads.