The Allis Chalmers 616 Special is a lawn tractor produced from 1981 to 1983 as part of the 600 Lawn Series. It was built by Simplicity and distributed by Allis Chalmers in Port Washington, Wisconsin, USA. It features a 16 hp Briggs & Stratton 655cc 2-cylinder gasoline engine, a 5-speed Peerless belt-driven gear transmission, and two-wheel manual steering. The tractor has a weight of 635 lbs with a 42-inch mower deck and uses lawn/turf tires sized 13x5.00-6 front and 18x9.50-8 rear. Attachments include a 42-inch mid-mount mower deck, snowblower, and blade. The tractor has an open operator station and disc brakes, with a mid independent PTO and mechanical idler pulley clutch.