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so i already have the bottom end built on my car however im puliing it back out and replacing the oil pump that is starting to go bad and also resealing it and throwing in new bearings. BUT my question is im building the head with double valve springs and titanium retainers and keepers , can i used new stock valves or is there a major difference in the aftermarket ones and the stock ones i know thre coated and what not but im turbo not like im oversizing them for naturally aspirtaed and also getting stage 3 cams for turbo from crower. just give me ur opinions thanks guys
