In 1971 lighting arrangement on the 356 GTB4 was superseded by a twin retractable system, as changes in USA legislation did not permit headlights behind covers.
The 365 GTC4 model was unveiled at the 1971 Geneva Show. it is effectively a replacement for two models in the range, the 365 GTC which had ceased production in 1970, and the 365 GT 2+2 that was dropped from production upon the announcement of the new model.

FERRARI 365 GTC4 £9,814 (incl. P.T.)
Ferrari keep coming up with superbly desirable cars and the latest 365 GTC/4, first shown at Geneva in March, is certainly no exception. It has a new, even better looking Pininfarina body on an improved version of the Daytona chassis. The engine is a four-cam 4.4 litre V12 that develops 320 b.h.p. at 6,600 r.p.m. and gives the car a top speed of 162 m.p.h. There are pop-up headlamps and unique fixed lamps inside the front grille that have a dual purpose. By day they act as long-range lamps for flashing, but they become fog lamps when the sidelamps are switched on.
London report

Series “M” cars were produced for a short period in the early part of 1971. They had five bolt fixing for the road wheels, an internal rear boot lid release catch, seat-mounted headrests, plus detail changes to the engine and gearbox, whilst the chassis received modification, resulting in an increase of 30mm in the rear track.
The Series “E” cars were produced from early 1971 to the end of production in 1974. They incorporated all the changes to the Series “M” examples, together with further modifications to the engine and gearbox. The windscreen wiper parking arrangement changed from central to right, on left-hand drive cars, whilst right-hand drive examples retained the central parking arrangement. Other visible differences were the repositioning of the door lock barrel from within the scallop to below it. The quarter bumpers finished short of the grille opening, the cooling ducts below the front quarter bumpers changed from plain rectangular openings, to formed circular inlets, and the rear number plate light became a chrome-plated rectangular unit mounted on the rear edge of the boot lid.
A USA market version was introduced at the end of 1971, which can be identified by the vertical instead of flush mounted indicator lights in the nose panel, and rectangular side marker lights cut into the front and rear wings.

Dino 206 S (Leandro Terra - Pietro Lo Piccolo) at Targa Florio.

Dino 246 GT (Gianluigi Verna - Francesco Cosentino) at Targa Florio.

5th at 24h Le Mans (#58 Bob Grossman / Coco Chinetti) by North American Racing Team - this is a conversion of a standard 1968 365 GTB 4.

365 GTB4 Competizione #14885 at 12h Sebring.

The first series of five competition examples, built in 1971, had all aluminium bodies. They featured slightly flared wheelarches with wider wheels, aerodynamic “fences” on the front wings, a small chin spoiler, and a lack of quarter bumpers, as the main identifying features.

3rd at 24h Le Mans: Ferrari 512 M, chassis #1020 (Tony Adamowicz / Sam Posey) by North American Racing Team.

4th at 24h Le Mans: Ferrari 512 M, chassis #1028 (Chris Craft / David Weir) by David Piper Autorace.

Ferrari 512 S Spyder, chassis #1006 (George Eaton / Masten Gregory) by North American Racing Team at 24h Le Mans.

512 M at 24 Hours Daytona.

The need for very high torque to cope with the torturous tracks of the Can Am series saw Ferrari build its biggest ever engine at around seven litres. This model is developed from a modified 512 M which is fitted with the new engine at the factory. The car won on its debut at the Imola Interserie race on May 2 1971 with Merzario at the wheel.

The new 1971 version of the sports prototype come with a flat-12 engine, often referred to as a boxer engine. In addition to a new engine, the chassis also differs in certain respects as aluminium panels are riveted to the small-diameter tubular spaceframe a further step towards the monocoque.

Formula 1 Victories:

1st GP South Africa 312B (#6 Andretti)
3rd GP South Africa 312B (#5 Regazzoni)
2nd GP Spain 312B (#4 Ickx)
3rd GP Monaco 312B2 (#4 Ickx)
1st GP Holland 312B2 (#2 Ickx)
3rd GP Holland 312B2 (#3 Regazzoni)
3rd GP Germany 312B2 (#6 Regazzoni)
3rd Formula 1 Manufacturers Championship ()

Ickx flying for the last success of the 312 B. He finished 2nd in Spanish GP.

Formula 1 Entries:

  GP South Africa
312B #4 Ickx
312B #5 Regazzoni
312B #6 Andretti
  GP Spain
312B #4 Ickx
312B #5 Regazzoni
312B #6 Andretti
  GP Monaco
312B2 #4 Ickx
312B2 #5 Regazzoni
312B #6 Andretti - dnq
  GP Holland
312B2 #2 Ickx
312B2 #3 Regazzoni
312B #4 Andretti
  GP France
312B2 #4 Ickx
312B2 #5 Regazzoni
  GP Great Britain
312B2 #4 Ickx
312B2 #5 Regazzoni
  GP Germany
312B2 #4 Ickx
312B2 #5 Andretti
312B2 #6 Regazzoni
  GP Austria
312B2 #4 Ickx
312B2 #5 Regazzoni
  GP Italy
312B #3 Ickx
312B2 #4 Regazzoni
  GP Canada
312B2 #4 Ickx
312B2 #5 Regazzoni
312B2 #6 Andretti
  GP USA
312B #32 Ickx
312B2 #5 Regazzoni
312B2 #6 Andretti - dns

312 B2

312 B2 at French GP.

312 B2 used in training at GP USA.

312 B2 at British GP.