My 3.8L engine died and I have ordered a good used 3.8L engine for my 98 Windstar. Of the good engine; i will be replacing most of the Gaskets which include the Head Gaskets, Intake etc. but, the Auto Parts Stores want to know the date of MFG the vehicle: After or Before Jan 14, 1998. My Questions is: since I won’t know the Date of the MFG Vehicle from which the engine is from. How can I conclude or know the MFG Date of the Engine since the vehicle is not available? I think there should be a serial number or an Identification number on the engine its self where we can look and calculate or conclude the MFG Date of the Engine. Need some guidance/help to figure this out. Thanks in advance to anyone that can help.