i guess is this is the right place for this. im wanting to get aftermarket cams. im looking at a stage 3 set up. i know that i have to upgrade my springs and retainers to run the cams but can i use my stock valves? also if i can use my stock valves cant this swap be done with out taking the head off of the block? im really wanting to do this with out taking the head off. any info will be great. thanks in advance.