Recently an English friend with a lot of experience in racing with Ford (Pinto) engines visited my workshop. What I did not know is that there is a ‘design problem’ with the flow of coolant around the 4th cylinder of the engine. Consequence: loss of power and problems with head gaskets potentially popping out on heavier loads. Especially with turbo due to higher thermal load. Easy to solve by modifying the rear freezer plug with a 90 degree nipple and connecting it to the lower radiator tube in the nose cone of the car. As a result, the flow & cooling increase substantially. Braze weld a lock nut on the back of the freezer plug, you can easily tighten the fixation nut at the front.