Cams run to 6500 rpm with stock hydraulic lifters; recommend solids not be installed. Stock base circle sizes allow the use of stock pushrods. N3 cams are bolt-in for 05-16 883/1200 engines with stock springs and heads (cams for 04-06 models with more than .465″ lift may need different valves, springs and collars). Made in the U.S.A..