I know this is probably kind of dumb, and I've tries to figure it out myself, but it's time to ask. What is EA81, EA82, & EA71...I think it relates to the engine size or maybe style, but I'm not sure. Also, does each one relate to a certain model or year?

you are right. It does dictate the engine size. It's the engine code that a lot of shops don't use but helps differ between an EA81 and an EA82, both of which are 1800cc engine. EA71 is a 1600cc (or 1.6 liter), made from about mid '77 to '80 with the top mounted starter (in '80 was only availible in the Brat with top mount), EA81 was from '80 to '89 depending on the car. The hatchback was made till '89 with the EA81 in it, Brat was made with the EA81 in it till '88? or so. Then the EA82 which is a over head cam model instead of over head valve like the EA81 and EA71's. EA82 was made from '85 to '94. From '90-'94, it was avalible in the Loyales since that was the only EA82 body style car left due to the start of the Legacy model line. Then there was also the ER27 which was only avalible in the XT6s. It was a 2.7 liter flat six; and EA82 with 2 more cylinders. That was avalible from '88-'91 IIRC... Hope that helps a bit

Thanks so much!!! I actually understand now.