Felpro for the valve seals or what brand?

 

I used the Mopar ones P5249661, just make sure they are made of viton.

 

What is the importance of viton?

 

More durable, and last longer.

 

felpro website has good info about umbrella type vs positive, and different material - nitrile, poly,viton. it doesn't say about any particular application, but coming from Federal Mogul and Felpro, i'd be suprised if it wasn't the best it could be.

http://aftermarket.federalmogul.com/...al%20Facts.pdf