I did the coolant crossover on all 3 of my Terminator motors to stop the number 7 cylinder from getting too hot and dropping the valve seat which was a big headache for Ford to fix on '03 Cobras. Dennis "king of the mark VIII " Reinhart bugged me till I did it swearing it would stop the problem and the parts were already sitting in the Lincoln parts bin for years solving a problem they knew they had but had to go through the whole fix learning cycle again. I took allot of heat on the internet for listening to someone that knew what he was talking about VS what the big fix was from the dealers if you could get them even to admit there was a problem in the first place. Do it, it is cheap, the parts are factory, you can put them in from under the car, you do have to remove the rear trans cross brace to let the engine down a little bit but it only takes an hour to do and I never had one leak.