Mercury 400ci Specs: 4.00 x 4.00 in

Mercury 400ci specs: 4.00 x 4.00 in (101.6 x 101.6 mm) bore and stroke. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	400 ci
Cylinders	8
Bore	4.000"
Stroke	4.000"
Advertised power	260 hp
Years	1971–1975

This engine

Engine	Displacement	Bore × Stroke	CR	HP
Mercury 400ci (1971–1975)	400 ci	4" × 4"	—	260

Factory cars with a Mercury 400ci

• Mercury Marquis: 1971, 260 hp; 1972; 1973; 1974; 1975
• Mercury Monterey: 1971, 260 hp; 1972; 1973; 1974
• Mercury Montego: 1972; 1973; 1975

What varies across the family

This family is represented by a single engine in the database: 400 ci, 8 cylinders, a 4" × 4" bore and stroke.

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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