2010 R/T Classic 6M
So I'm doing a 392 cam swap and using the Mopar performance valve springs which I've been told require a 1mm shim when using the 392 cam which is what should come on my car already. But when ordering this part from mopar the recommended me to a new part that is just a regular stock spring but updated, it doesn't allow the extra lift which is the reason im not using it. But the mopar rep told me to remove old spring and 2MM shim and replace with new spring with new 1MM shim. Did 2010 cars not come with a 1mm shim and had a 2mm instead? I'd like to know if I need to order shims before I open the motor up as I plan on doing it all in 1 or 2 days and can't be waiting on parts to come in if I have to order new shims.