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Overview

Ferrari 275 GTB4 - 1966

1966

275 GTB4

Presented at the 1966 Paris Motor Show, this was the first ‘production’ Ferrari to be fitted with the four overhead camshaft version of the V12, and was derived directly from the P2 prototype.

Focus on

With its six Weber 40 DCN carburettors, the new engine was more torquey at medium revs, even though its maximum power output was reached at 8,000 rpm. New American safety regulations meant that this model was only produced for a year and a half, during which some 280 were built.

The 275 GTB4 berlinetta was the replacement for the 275 GTB, the main difference being the fitment of a four overhead camshaft, two per bank, V12 engine. It was first shown at the 1966 Paris Salon, and remained in production until March 1968, during which time 330 examples were manufactured in the chassis number range 09007 to 11069.

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Ferrari 275 GTB4 - 1966
Ferrari 275 GTB4 - 1966

The Design

The 275 GTB/4 was virtually identical visually to the “long nose” two camshaft models, and without lifting the bonnet, there was only one easy distinguishing feature. This was the profile of the bonnet, which on the 275 GTB/4 had a slim shallow central bulge running from front to rear. This should not be confused with the wide flat raised centre section of the bonnet seen on early two camshaft cars. As with the two camshaft cars, the Pininfarina designed body was constructed by Scaglietti, normally in steel with aluminium doors, bonnet, and boot lid, although a few examples received full aluminium bodies.

The bodies were mounted on a 2400mm wheelbase chassis that had factory reference numbers 596, and all were numbered in the odd chassis number road car sequence. The chassis was virtually identical to that of the two camshaft car, the revised number being due to minor differences in the drive train layout. Like its predecessor, the four camshaft model was available in right or left hand drive form. The standard wheels were alloy with a ten hole design, with the option of Borrani wire wheels throughout the production period, retained by a triple ear spinner.

European market examples had circular rear light units with the upper section in orange for the turn signal, and featured a central circular reflector. US market cars had a full red rear lens with a central horizontal rectangular reflector.

The Engine

The basic dimensions and layout of the engine were similar to that of the two camshaft unit of the 275 GTB, but fitted with new cylinder heads that featured twin overhead camshafts per bank of cylinders, with factory type reference 226, still of 3286cc capacity, with a bore and stroke of 77mm x 58.8mm, with the sparking plugs sited between the camshafts.

The other major difference was the provision of dry sump lubrication. It was fitted with a bank of six Weber 40 DCN9, 17, or 18 carburettors, with a twin coil and rear of engine mounted distributor ignition system, to produce a claimed 300bhp. The engine drove through a shaft in a torque tube, as fitted to late series two camshaft models, running at engine speed to a five speed transaxle, which was independently supported from the chassis frame, and then by drive shafts to the independently suspended rear wheels, that featured the same coil spring and wishbone suspension arrangement as used on the two camshaft 275 GTB model.

No competition versions of this model were built, although a number of clients used lightly modified road cars in various types of events, mainly for their own enjoyment rather than outright victory.

Ferrari 275 GTB4 - 1966

Careful selection of the best shots of the 275 GTB4 in high definition. The photo gallery shows the distinctive features of this model Ferrari in 1966, focusing on the details and the most important parts.

Specifications

V12  Engine

Type front, longitudinal 60° V12
Bore/stroke 77 x 58.8 mm
Unitary displacement 273.81 cc
Total displacement 3285.72 cc
Compression ratio 9.2 : 1
Maximum power 221 kW (300 hp) at 8000 rpm
Power per litre 91 hp/l
Maximum torque -
Valve actuation twin overhead camshafts per bank, two valves per cylinder
Fuel feed six Weber 40 DCN 9 carburettors
Ignition single spark plug per cylinder, two coils
Lubrication dry sump
Clutch single-plate
Frame tubular steel
Front suspension independent, unequal-length wishbones, coil springs over telescopic shock absorbers, anti-roll bar
Rear suspension independent, unequal-length wishbones, coil springs over telescopic shock absorbers, anti-roll bar
Brakes discs
Transmission 5-speed + reverse
Steering worm and roller
Fuel tank capacity 94 litres
Front tyres 205 x 14
Rear tyres 205 x 14
Type two-seater, berlinetta
Length -
Width -
Height -
Wheelbase 2400 mm
Front track 1401 mm
Rear track 1417 mm
Weight 1100 kg (dry)
Top speed 268 km/h
Acceleration 0-100 km/h -
0-400 m -
0-1000 m -