(Big Bud 16V-747) at the Penfield Tractor Show in Penfield, Champaign County, IL. The 16V-747 was built in 1978. It has a Detroit Diesel 24.1L, 16 cyl, 1100hp engine & a 1,000 gal fuel tank. The tires are about 8 feet in diameter. This Big Bud is the largest farm tractror in the world & only this 1 was built. [Big Bud 16V-747] Photo 7-9-09.