West coast teams don't do well when they have to come east. It's a betting wrinkle well known enough to be axiomatic, but here's a thorough reminder—with some additional facts you might not have known.
Sports Insights made the infographic below using its data analysis software. It shows the old wisdom bearing out. The interesting bits are that teams do worse the farther they travel east, and also that teams coming off of wins against the spread do massively worse (owing to the books inflating the lines for teams that are coming off of wins).