Pontiac 455ci Specs: 4.153 x 4.214 in

Pontiac 455ci specs: 4.153 x 4.214 in (105.5 x 107 mm) bore and stroke, shared by all 5 versions. Displacement, compression and factory ratings.

At a glance

Displacement	455 ci
Cylinders	8
Bore	4.153"
Stroke	4.214"
Compression	8.1:1
Advertised power	200–370 hp
Years	1970–1976
Cylinder head data	1 of 5 engines

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
Pontiac 455ci · 4.153" × 4.214" · 8.051:1	455 ci	4.153" × 4.214"	8.051:1	200
L75	455 ci	4.153" × 4.214"	—	250–325
LS5	455 ci	4.153" × 4.214"	—	300–335
LS2	455 ci	4.153" × 4.214"	—	290–310
Pontiac 455ci (1970–1974)	455 ci	4.153" × 4.214"	—	250–370

Factory cars with a Pontiac 455ci

• Pontiac Grand Prix: 1970, 370 hp; 1971, 325 hp; 1972, 250 hp; 1973, 250 hp; 1974, 250 hp; 1975, 200 hp; 1976, 200 hp
• Pontiac GTO: 1970, 360 hp; 1971, 325 hp; 1971, LS5, 335 hp; 1972, 250 hp; 1972, LS5, 300 hp; 1973, 250 hp
• Pontiac Firebird: 1971, L75, 325 hp; 1971, LS5, 335 hp; 1972, LS5, 300 hp; 1973, L75, 250 hp; 1973, LS2, 310 hp; 1974, L75, 250 hp; 1974, LS2, 290 hp; 1975, L75, 200 hp; 1976, L75, 200 hp
• Pontiac LeMans: 1971, 325 hp; 1971, 335 hp; 1972, L75, 250 hp; 1972, LS5, 300 hp; 1973, L75, 250 hp; 1974, L75, 250 hp; 1976, L75, 200 hp

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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