Shelby 427ci Specs: 107.5 x 96.1 mm

Shelby 427ci specs: 107.5 x 96.1 mm (4.2320 x 3.7840 in) bore and stroke. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	427 ci
Cylinders	8
Bore	4.232"
Stroke	3.784"
Compression	11.1:1
Advertised power	425 hp
Years	1966–1967

This engine

Engine	Displacement	Bore × Stroke	CR	HP
Shelby 427ci (1966–1967)	427 ci	4.232" × 3.784"	11.1:1	425

Factory cars with a Shelby 427ci

• Shelby Cobra: 1966, 425 hp; 1967, 425 hp

What varies across the family

This family is represented by a single engine in the database: 427 ci, 8 cylinders, a 4.232" × 3.784" bore and stroke.

All are oversquare — bore larger than stroke, which favours revs over low-end torque.

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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