The so called "shim" is a spacer. It looks like a ring or a washer. The shim or spacer slides onto the rocker shaft the same as the rocker arms. There are four spacers on each shaft and each spacer separates the two rocker arms for each respective cylinder. When the rocker arm is assembled and installed correctly and going from one end to the other, you will see:
Narrow hold down;exhaust rocker; shim; intake rocker; wide hold down; I rocker; shim; E rocker; N hold down;...repeat.
Let me know if you have any pther questions or comments.
Chris the K MANIAC
-----Original Message-----
From: Dave Dumais dave.dumais@xxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx>
To: Chrysler300Club Intl. <chrysler300@xxxxxxxxxxxxxxx>
Sent: Wed, Dec 24, 2014 1:54 pm
Subject: [Chrysler300] 413 ROCKER ARMS