Pontiac Iron Duke Specs: 4.00 x 3.00 in

Pontiac Iron Duke specs: 4.00 x 3.00 in (101.6 x 76.2 mm) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings.

At a glance

Displacement	151 ci
Cylinders	4
Bore	4.000"
Stroke	3.000"
Compression	8.2:1
Advertised power	90–110 hp
Years	1982–1990

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
LR8	151 ci	4" × 3"	8.2:1	90
LR8	151 ci	4" × 3"	—	90–110

Factory cars with a Iron Duke

• Buick Skylark: 1982, LR8, 90 hp; 1984, LR8, 92 hp
• Oldsmobile Cutlass: 1982, LR8, 92 hp; 1983, LR8, 92 hp; 1984, LR8, 92 hp; 1985, LR8, 92 hp; 1987, LR8, 98 hp; 1988, LR8, 98 hp; 1989, LR8, 98 hp; 1990, LR8, 110 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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