Porsche M64 Specs: 100 x 76.4 mm

Porsche M64 specs: 100 x 76.4 mm (3.9370 x 3.0079 in) bore and stroke, shared by all 7 versions. Displacement, compression and factory ratings.

At a glance

Displacement	219.7 ci
Cylinders	6
Bore	3.937"
Stroke	3.008"
Compression	11.3:1
Advertised power	247–424 hp
Years	1989–1998

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
M64/01	219.7 ci	3.937" × 3.0079"	11.3:1	250
M64/01, M64/02	219.7 ci	3.937" × 3.0079"	—	247
M64/50	219.7 ci	3.937" × 3.0079"	—	355
M64 (1994–1997)	219.7 ci	3.937" × 3.0079"	—	380–424
M64/07, M64/08	219.7 ci	3.937" × 3.0079"	—	270
M64/23, M64/24	219.7 ci	3.937" × 3.0079"	—	282
M64/60	219.7 ci	3.937" × 3.0079"	—	400

Factory cars with a M64

• Porsche 911: 1989, 247 hp; 1990, 247 hp; 1991, 247 hp; 1992, 247 hp; 1993, 247 hp; 1994, 247 hp; 1994, 355 hp; 1994, 380 hp; 1995, 270 hp; 1996, 282 hp; 1996, 400 hp; 1997, 282 hp; 1997, 400 hp; 1997, 424 hp; 1998, 282 hp

What varies across the family

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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