Cadillac 350ci Engine Specs

Bore, stroke, displacement and compression for all 4 Cadillac 350ci engines, compared side by side. Plus rod ratio and head specs where published.

At a glance

Displacement	350 ci
Cylinders	8
Bore	4.000–4.057"
Stroke	3.385–3.480"
Compression	8.0–9.4:1
Advertised power	105–255 hp
Years	1976–2000

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
L31	350 ci	4" × 3.48"	9.4:1	255
LF9	350 ci	4.057" × 3.385"	—	105–125
Cadillac 350ci (1976–1980)	350 ci	4.057" × 3.385"	—	170–180
L49	350 ci	4.057" × 3.385"	8:1	—

Factory cars with a Cadillac 350ci

• Cadillac Seville: 1976, 180 hp; 1977, 180 hp; 1978; 1978, LF9; 1979; 1979, LF9; 1980, L49; 1980, LF9, 105 hp; 1981, LF9, 105 hp; 1982, LF9, 105 hp; 1983, LF9, 105 hp; 1984, LF9, 105 hp; 1985, LF9, 105 hp
• Oldsmobile 98: 1978, LF9; 1979, LF9
• Cadillac Eldorado: 1979, LF9, 125 hp; 1979, 170 hp; 1980; 1980, LF9, 105 hp; 1981, LF9, 105 hp; 1982, LF9, 105 hp; 1983, LF9, 105 hp; 1984, LF9, 105 hp; 1985, LF9, 105 hp
• Oldsmobile Toronado: 1979, LF9

What varies across the family

Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.

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 Cadillac engines