Wide power band for modified engines Bolt in for stock 103'' and 110'' enginesWorks well with 95'', 106'', 107'' and 114'' big bore enginesRPM range 2000-6800Smooth lobe design creates a very smooth valvetrain motionResponds to modified cylinder heads, increased compression ratio, performance exhaust and intake systemsPerformance pushrods and lifter recommended.Requires '07-'17 factory tensioners, outer sprocket, chains, hardware and performance valve springs on '99-'04 engines.