Hey guys i am building a GSR head and i am wondering about which type of valves and Valve springs to use i narrowed it down to Skunk2, Crower, or Ferrea, I have put in new Ferrea Bronze valve guides, I like the skunk2 and crower cams, i want the head to be able to handle 9500 rpm if i wanted to spin the motor that high so 9500 is just the minimun insurance. what are your opinion on the Skunk2 crower and ferrea,

 

I like ferrea valves, skunk2 springs and crowers new Ti retainers are probably the thickest of the bunch. Crower springs are also high quality but I'd probably roll w/ the skunk2 springs w/ stock retainers if I did it again.

 

i can get the Skunk2 springs with retainers for $350 crowers springs with retainers for 485, and more than likely i will be using ferrea valves get a 3 angle valve job port and polish will this handle 9500rpm?

 

I went to 9k w/ stock valves, stock retainers and skunk2 springs. Thus, you should have no problems....assuming you have the power adder to pull it that far.