Power band for modified engines and an excellent bolt-in for stock 96", 103" and 110" engines Responds well to modified cylinder heads increased compression ratio, performance exhaust and intake systems Extremely smooth cam-lobe design creates a smooth and quiet valvetrain 2100-6500 RPM power range Performance valve springs required on '99-'04 engines and performance pushrods and lifers recommended.. CAMS CONV 574C 99-06TC