i just put heads like 2 months ago... with the heads bought roller rockers, pushrods... less than 2000 miles on the heads and roller rockers...i decided to go from a E-cam to an F-cam .. i already bought the cam and it should be here next week... now like i've said RR have less that 2000miles on obviously i dont wanna pay 200 just to buy new ones since the ones that i have there brand new... so can i use the old RR?