Chevrolet 305ci Specs: 3.736 x 3.484 in

Chevrolet 305ci specs: 3.736 x 3.484 in (94.9 x 88.5 mm) bore and stroke, shared by all 18 versions. Displacement, compression and factory ratings.

At a glance

Displacement	305 ci
Cylinders	8
Bore	3.736"
Stroke	3.484"
Compression	9.9–11.4:1
Advertised power	130–230 hp
Years	1976–1998
Cylinder head data	3 of 18 engines

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
Chevrolet 305ci (1985) · 175 hp	305 ci	3.736" × 3.484"	11.101:1	175
Chevrolet 305ci (1985) · 150 hp	305 ci	3.736" × 3.484"	9.901:1	150
Chevrolet 305ci (1985) · 215 hp	305 ci	3.736" × 3.484"	11.3:1	215
Chevrolet 305ci · 3.736" × 3.484" · 10.49:1	305 ci	3.736" × 3.484"	10.49:1	195–220
Chevrolet 305ci · 3.736" × 3.484" · 11.38:1	305 ci	3.736" × 3.484"	11.38:1	170
Chevrolet 305ci · 3.736" × 3.484" · 10.3:1	305 ci	3.736" × 3.484"	10.3:1	210–230
Chevrolet 305ci · 3.736" × 3.484" · 10.35:1	305 ci	3.736" × 3.484"	10.35:1	205–230
Chevrolet 305ci (1976–1978)	305 ci	3.736" × 3.484"	—	140–145
LG9	305 ci	3.736" × 3.484"	—	130–140
LE9	305 ci	3.736" × 3.484"	—	160–165
L03	305 ci	3.736" × 3.484"	—	170–175
L30	305 ci	3.736" × 3.484"	—	220–230
LG3	305 ci	3.736" × 3.484"	—	130–145
LG4	305 ci	3.736" × 3.484"	—	145–180
LU5	305 ci	3.736" × 3.484"	—	165–175
L69	305 ci	3.736" × 3.484"	—	175–190
LB9	305 ci	3.736" × 3.484"	—	190–230
LO3	305 ci	3.736" × 3.484"	—	170

Factory cars with a Chevrolet 305ci

• Chevrolet Camaro: 1976, LG3, 140 hp; 1977, LG3, 145 hp; 1978, LG3, 145 hp; 1979, LG3, 130 hp; 1980, LG4, 155 hp; 1981, LG4, 150 hp; 1981, LG4, 165 hp; 1982, LG4, 145 hp; 1982, LU5, 165 hp; 1983, LG4, 150 hp; 1983, LU5, 175 hp; 1983, L69, 190 hp; 1984, LG4, 150 hp; 1984, L69, 190 hp; 1985, LG4, 155 hp; 1985, L69, 190 hp; 1985, LB9, 215 hp; 1986, LG4, 155 hp; 1986, LG4, 165 hp; 1986, L69, 190 hp; 1986, LB9, 190 hp; 1987, LG4, 165 hp; 1987, LG4, 170 hp; 1987, LB9, 190 hp; 1987, LB9, 215 hp; 1988, L03, 170 hp; 1988, LB9, 195 hp; 1988, LB9, 220 hp; 1989, L03, 170 hp; 1989, LB9, 195 hp; 1989, LB9, 220 hp; 1989, LB9, 230 hp; 1990, L03, 170 hp; 1990, LB9, 210 hp; 1990, LB9, 230 hp; 1991, L03, 170 hp; 1991, LB9, 205 hp; 1991, LB9, 230 hp; 1992, L03, 170 hp; 1992, LB9, 205 hp; 1992, LB9, 230 hp
• Chevrolet Chevelle: 1976, LG3, 140 hp; 1977, LG3, 145 hp
• Chevrolet El Camino: 1976, LG3, 140 hp; 1977, LG3, 145 hp; 1978, LG3, 145 hp; 1979, LG4, 160 hp; 1980, LG4, 155 hp; 1981, LG4, 150 hp; 1982, LG4, 145 hp; 1983, LG4, 150 hp; 1984, LG4, 150 hp; 1985, LG4, 150 hp; 1986, LG4, 150 hp; 1987, LG4, 150 hp
• Chevrolet Monte Carlo: 1976, LG3, 140 hp; 1977, LG3, 145 hp; 1978, LG3, 145 hp; 1979, LG4, 160 hp; 1980, LG4, 155 hp; 1981, LG4, 150 hp; 1982, LG4, 145 hp; 1983, LG4, 150 hp; 1983, L69, 175 hp; 1984, LG4, 150 hp; 1984, L69, 180 hp; 1985, LG4, 150 hp; 1985, L69, 180 hp; 1986, LG4, 150 hp; 1986, L69, 180 hp; 1987, LG4, 150 hp; 1987, L69, 180 hp; 1988, LG4, 150 hp; 1988, L69, 180 hp
• Chevrolet Nova: 1976, LG3, 140 hp; 1977, LG3, 145 hp; 1978, LG3, 145 hp; 1979, LG3, 130 hp
• Chevrolet Suburban: 1976, 140 hp; 1977, 140 hp; 1978, 145 hp; 1979, LG9, 140 hp; 1981, LE9, 165 hp; 1982, LE9, 160 hp; 1983, LE9, 160 hp; 1984, LE9, 160 hp; 1985, LE9, 160 hp; 1986, LE9, 160 hp; 1987, L03, 170 hp
• Chevrolet C/K Pickup: 1977, 145 hp; 1978, 145 hp; 1979, LG9, 140 hp; 1980, LG9, 135 hp; 1981, LE9, 165 hp; 1982, LE9, 165 hp; 1983, LE9, 165 hp; 1984, LE9, 160 hp; 1985, LE9, 160 hp; 1986, LE9, 160 hp; 1987, L03, 170 hp; 1988, L03, 175 hp; 1989, L03, 175 hp; 1990, L03, 175 hp; 1991, L03, 175 hp; 1992, L03, 175 hp; 1993, L03, 175 hp; 1994, L03, 175 hp; 1995, L03, 175 hp; 1996, L30, 220 hp; 1997, L30, 220–230 hp; 1998, L30, 220–230 hp
• Chevrolet Caprice: 1977, LG3, 145 hp; 1978, LG3, 145 hp; 1979, LG3, 130 hp; 1980, LG4, 155 hp; 1981, LG4, 150 hp; 1982, LG4, 145 hp; 1983, LG4, 150 hp; 1984, LG4, 150 hp; 1985, LG4, 165 hp; 1986, LG4, 165 hp; 1987, LG4, 170 hp; 1988, LG4, 170 hp; 1989, L03, 170 hp; 1990, L03, 170 hp; 1991, L03, 170 hp; 1992, L03, 170 hp; 1993, L03, 170 hp
• Chevrolet Impala: 1977, LG3, 145 hp; 1978, LG3, 145 hp; 1979, LG3, 130 hp; 1980, LG4, 155 hp; 1981, LG4, 150 hp; 1982, LG4, 145 hp; 1983, LG4, 150 hp; 1984, LG4, 150 hp; 1985, LG4, 165 hp
• Chevrolet K5 Blazer: 1977, LG9, 140 hp; 1978, LG9, 140 hp; 1979, LG9; 1981, LG9, 130 hp; 1982, LE9, 165 hp; 1983, LE9, 160 hp; 1984, LE9, 160 hp; 1985, LE9, 160 hp; 1986, LE9, 160 hp; 1987, LO3, 170 hp
• Chevrolet Corvette: 1980, LG4, 180 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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