Buick 138ci Engine Specs

Bore, stroke, displacement and compression for all 2 Buick 138ci engines, compared side by side. Plus rod ratio and head specs where published.

At a glance

Displacement	138 ci
Cylinders	4
Bore	3.622"
Stroke	3.346"
Advertised power	115–160 hp
Years	1990–1995

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
LD2	138 ci	3.622" × 3.3465"	—	150–160
L40	138 ci	—	—	115

Factory cars with a Buick 138ci

• Buick Skylark: 1990, LD2, 160 hp; 1991, LD2, 160 hp; 1994, L40, 115 hp; 1995, LD2, 150 hp

What varies across the family

1 of 2 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 Buick engines