Prior to the 1916 Amateur, I believe Merion East was played to par 73 (I'll have to check my notes) and Merion West to par 70. Versus par, many believed Merion West was as difficult as the East Course. Bear in mind that the East course underwent significant changes almost from opening day in 1912 up until 1934. The course we think of today was a lot different for the 1916 Amateur. The West Course has a lot more elevation change than the East Course, especially on the southern portion of the property. There are a lot more shots that are hard to figure out due to elevation changes and proximity to streams and other hazards including the clubhouse: tee shot on 4, tee shot and approach shots on 5, tee shot on 6, tee shot (tee points directly OB) and approach shot on 7, tee shot on 8, approach shot on 10, approach shot on 11, approach shot on 16, approach shot on 17 and approach shot on 18.
I think it would be beneficial to anyone playing Merion East to ask their host to arrange play on the West Course as well. Over time, the effects of technology have impacted the way longer, less topographic courses are played. They are easier. However, courses with quirk, elevation change and features that make golfers think (sometimes question, sometimes fear) still provide interesting challenges, if only between the ears. Play Merion West. It is a throwback course and one you will enjoy playing. For members, it is enjoyable all year round, 7 days a week.