Series 1 - 1969-73, 2 × SU HD8 carburettors Jaguar XJ6 4.2 Series 2 - 1973-74, 2 × SU HS8 carburettors (North American specification XJ6 used 2 × Zenith-Stromberg 175 CDSE carburettors for reduced emissions) Daimler Sovereign 4.2 'XJ6' Series 2 - 1973-74, 2 × SU HS8 carburettors Jaguar XJ6 L 4.2 Series 2 - 1973-79, 2 × SU HS8 carburettors. From 1977, 2 × SU HIF7 carburettors, US market from May 1978 Bosch-Lucas L-Jetronic electronic injection Daimler Sovereign LWB 4.2 'XJ6' Series 2 - 1973-79 (and Daimler Vanden Plas 1975-79), 2 × SU HS8 carburettors. From 1977, 2 × SU HIF7 carburettors, US market (VDP only) from May 1978 Bosch-Lucas L-Jetronic Jaguar XJ6 4.2 Series 3 - 1979-87, 2 × SU carburettors or Bosch-Lucas L-Jetronic electronic injection Daimler 4.2 'XJ6' Series 3 - 1979-86, 2 × SU carburettors or Bosch-Lucas L-Jetronic electronic injection Daimler DS420 Limousine - 1968-92, 2 × SU HD8 carburettors. From 1985 Bosch-Lucas L-Jetronic electronic injection Panther J.72 Panther De Ville It was also used in the Combat Vehicle Reconnaissance (Tracked) - CVR(T) - family of military vehicles: e.g., FV101 Scorpion, a light tank FV107 Scimitar, an armoured reconnaissance vehicle and the corresponding Combat Vehicle Reconnaissance (Wheeled) - CVR(W) - family: e.g., Fox armoured reconnaissance vehicle plus the Dennis D600 fire engine. 2.8-litre A 2.8-litre version of the XK was introduced for the entry-level XJ6 models in 1968. It had a similar short block to the old the 2.4 with addition of the later two rear water cooling holes for the straight port cylinder head, retaining the bore of but lengthening the stroke by to to give a displacement of 2,792 cc / 170.4 cu-in. The power output of the 2.8 was listed as DIN net, which cannot be directly compared with the 133 bhp SAE gross of the last of the 2.4s in the 240 Mark 2. The 2.8 gained a bad reputation early in its career due to a tendency for excessive carbon deposits to accumulate on the piston crowns during low-speed running, which would burn through the crowns when run at higher revs. This was later cured by a switch to stronger pistons but the engine was also a mediocre performer offering no real economy benefit and it was dropped in 1973, to be replaced by the ‘new’ 3.4. All of the 2.8-litre XK engines used the straight port head unpainted, which some