im getting ready to boost my gsr and im working on a head setup now. i was planning on getting the skunk2 dual valve springs from ebay for my head. my question is can i still use my gsr valves and retainers with the keepers? or should i just find type r springs and use my gsr retainers and keepers. need some opinions here cause i want to rev to like 8.5k with ctr cam.

 

get supertech valvetrain.

 

Will I still be able to use the factory valves and retainers?