Year and model?
There is usually also a marking on the head, if you can see it, it should say 2.5 or 2.7.
Also you can usually tell from the intake manifold, the 2.7Ls use a less efficient design. So assuming no one changed the Intake mani, you can tell by that.
BTW: if you still have that 86 325e, its a 2.7L .
Last edited by T.Dot_E30; 02-27-2006 at 08:50 PM.