I had went to autozone becuase i had to get the computer read (service engine soon light from a different post) and the guy there was asking me what engine i had and i told him i didnt know becuase i thought they all had the same engine and he said no, that some were one kind and some were another.
I dont remember exactly what he said, but it was something about numbers, where some were 1 and some were 2??
He was pointing to the long black covers on the engine (see attachment)?