Engine or motor?

Kind of a silly post here but I'm bored and looking for cheap thrills.

What do you call the powerplant in your car, an engine or motor? I've always associated the word motor with a small electric motor, like a drill or something.

However, all my life I've been hearing guys say things like "I'm gonna pull the motor" or "I'm building a new motor". To me, this is incorrect syntax.

Motor sounds tough though and engine sounds like engineering and ultimately nerdiness.

I say engine. What say you?
Which ever the local parts house counter person needs to hear to get me the right parts for the car: IE: if he/she says "what motor" than its motor if he/she says "what Engine" than it's engine~