Rear Rocker Pillar Modification

Many TA owners suffer from an accumulation of oil in the radiator header tank. This is often caused by a crack in the cylinder head normally on the top around the area above cyls. 2 & 3 exhaust port which gets incredibly hot. Another possible cause of the problem is the pressure oil feed into the cylinder head due to porosity in the casting. This modification moves the oil feed to the rockers to being outbound of the back of the head where coolant is present. This modification can be done without the need to strip the cylinder head down, and should not be beyond the scope of a competent home mechanic. You will need a couple of BSF spanners, a scriber, electric drill and a small allen key. You will be replacing the rear rocker pillar.