GMC 231ci Specs: 3.799 x 3.402 in

GMC 231ci specs: 3.799 x 3.402 in (96.5 x 86.4 mm) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.

At a glance

Displacement	231 ci
Cylinders	6
Bore	3.799"
Stroke	3.402"
Compression	8.0:1
Years	1978–1984

This engine

Engine	Displacement	Bore × Stroke	CR	HP
LD5	231 ci	3.7992" × 3.4016"	8:1	—

Factory cars with a GMC 231ci

• GMC Sprint / Caballero: 1978, LD5; 1979, LD5; 1981, LD5; 1983, LD5; 1984, LD5

What varies across the family

This family is represented by a single engine in the database: 231 ci, 6 cylinders, a 3.7992" × 3.4016" 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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