GMC 351ci Specs: 4.563 x 3.58 in

GMC 351ci specs: 4.563 x 3.58 in (115.9 x 90.9 mm) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.

At a glance

Displacement	351 ci
Cylinders	6
Bore	4.563"
Stroke	3.580"
Advertised power	220 hp
Years	1966–1968

This engine

Engine	Displacement	Bore × Stroke	CR	HP
351E	351 ci	4.5625" × 3.58"	—	220

Factory cars with a GMC 351ci

• GMC C/K Pickup: 1966, 220 hp; 1967, 220 hp; 1968, 220 hp

What varies across the family

This family is represented by a single engine in the database: 351 ci, 6 cylinders, a 4.5625" × 3.58" 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.

← All GMC engines