Early on, the RB
.211-22 series had hot section reversers. After a few months in service it became apparent they werent needed and were removed to save on maintenance costs. This changed the profile of the engine somewhat by shortening the exhaust cone. This profile remaned the same thru the RB
.211-524D and F models used on the 747-200/-300 and L1011-250.
.211-524G and H, along with the 535 series, models use a composite nacelle thats more aerodynamic. All RB
.211 powered 747-400s, 767-300s along with most (some earlier ones have a 3rd cowl type) 535 powered 757s have the newer full length cowl instead of the shorter cowl seen on the earlier variants.
Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety.