Jaguar 259ci Specs: 92.1 x 106 mm

Jaguar 259ci specs: 92.1 x 106 mm (3.6250 x 4.1730 in) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings.

At a glance

Displacement	259 ci
Cylinders	6
Bore	3.625"
Stroke	4.173"
Compression	8.1:1
Advertised power	265 hp
Years	1965–1987

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
XK 4.2	259 ci	3.625" × 4.173"	—	265
XK 4.2 EFI	259 ci	3.625" × 4.173"	8.1:1	—

Factory cars with a Jaguar 259ci

• Jaguar E-Type: 1965, 265 hp; 1966, 265 hp; 1967, 265 hp; 1968; 1969; 1970; 1971
• Jaguar XJ6: 1969; 1970; 1971; 1972; 1973; 1974; 1975; 1976; 1977; 1978; 1979; 1980; 1982; 1984; 1985; 1986; 1987

What varies across the family

All are undersquare — stroke larger than bore, favouring torque low in the range.

Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.

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