Car started leaking water externally at the rear of the motor, so I organised my spare 531 and 38mm valves to be mated together. The Port was modified to match also. As can be seen.
Old 35mm valve in the modified head. Vs the 38mm stainless valve.
The culprit. The car has been cooked three times in 130,000kms and one of them it boiled over.
Frustrating, but I need a running car!