I've got a stage 1 cam in my Raptor 660 right now and I want to upgrade to a stage 2. I've got 2 different opinions for 2 very reputable sources about installing this cam:

1 - Install the Hot Cams springs. One or more of the valve guides need to be trimmed down or the vavle seal(s) will be smashed over time. Price i was quoted was $30 to do the work.
2 - Install the Hot Cams springs and you're good to go.

Has anyone installed the stage 2 cam in your Raptor? Did you have to do any work other than the new springs? Any problems if you didn't?

 

So nobody on this forum has a stage 2 cam in their Raptor 660 huh?

 

Mine is an 01 w/ stage 2. Works well. I used kibblewhite springs and did the valve guide machining myself-very easy.

 

The guide that needs trimmed is the middle intake. It sits a little higher in the head than the others and therefore gets the most lift from the rocker. I cant remember the amount of trimming hotcam recommends but its not much. It can be done at home with non-special tools as long as you can get the valve out by yourself. Also if you go to a stiffer spring kit you can expect accelerated rocker arm pad wear, but it's not to big of a problem.