Over its seven years in production, the 411 showed a number of changes. The 1971
Series 2 added self-levelling suspension and a
metric odometer, while the
Series 3 from a year later had a lower compression ratio and completely revised styling. This edition was the first Bristol to possess the four-headlamp layout that was oddly anticipated by some of the company's earliest models, and to power this a bigger alternator was used. For the
Series 4 of 1974, the compression ratio was reduced dramatically (from 9.5:1 to 8.2:1) but this was compensated for by using a larger version of the B series engine with a capacity of . Previously, engine power outputs in the United States were quoted as gross power. By the time the larger engine was supplied to Bristol, the figures were quoted as net power outputs. The Series 4 & 5 cars engines produced and torque. The rear lights were also changed using vertically mounted rectangular Lucas clusters, that carried over to the early 603 models. The
Series 5 made from 1975 to 1976 had the original Bristol badge restored and was the first Bristol to feature inertia reel
seat belts. In the 2010s Bristol Cars offered a modernised version of the Bristol 411, the Series 6. This was a refurbished version based on existing 411s. The only engine is the fuel injected 5.9 litre Chrysler Magnum V8 as used in the later
Bristol Blenheim, allowing for up to depending on the customer's desires. File:Bristol 411 Series 1 (1970).jpg|Series 1 interior File:Bristol 411 S1.jpg|Series 1, rear view File:Bristol 411 .jpg|Bristol 411 Series 4, with quad headlights File:Bristol 411 Series 6.jpg|Series 6 ==Notes==