I think you getting a little heated.It appears that the colors change quite often and this would appear to confuse people about the springs.The guy who assembles engine at the Ford plant would simply be taking them out of a bin and installing them.Unless he tests the springs in a spring tester how would he know.Only by color. and as we keep getting told the color changes frequently.Secondly the cylinder heads when purchased from Ford are bare no valves or springs and seeing as all the heads are the same it would stand to reason that the part numbers are the same.The reason Ford sell them this way is so they can be made to fit LPG gas, N/A petrol, Turbo model's,and Typhoon. You see LPG engines run different inlet valve to all the others N/A just have std material valves,Turbo's have inconell exhaust valves and Typhoons have standard turbo valve but with different valve springs.Imagine all the exta stock Ford would have to have assembled if they had all these different heads in stock waiting,compared to just selling bare units. I'm afraid if Nizpro has tested them them he would be 99% correct.