Buick 1940s General Specs
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| Year | Prod Total |
Model Designation |
Wheel base Inches |
Weight Min/Max |
Tire Size |
Wheel Bolt Pattern |
Valve Location |
Bore and Stroke |
Piston Dis place ment Cubic Inches |
Com pres sion Ratio (Stan dard) |
Maximum Brake H.P. @ R.P.M. |
Spark Plug Type |
Spark Plug Gap |
Point Gap |
Firing Order |
Ignition Timing BTDC or Mark |
Grnd +/- Volts |
|
| 1940 | 112,974 | Special 8 | 40-40 | 121 | 3505/3755 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.1 | 107 @ 3400 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 |
| 128,736 | Super 8 | 40-50 | 121 | 3735/3895 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.1 | 107 @ 3400 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 9,473 | Century 8 | 40-60 | 126 | 3765/4050 | 7.00x15 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 6.25 | 141 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 18,345 | Roadmaster 8 | 40-70 | 126 | 3990/4195 | 7.00x15 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 6.25 | 141 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 4,316 | Limited 8 | 40-80 | 133 | 4380/4550 | 7.50x16 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 6.25 | 141 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 1,739 | Limited 8 | 40-90 | 140 | 4590/4705 | 7.50x16 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 6.25 | 141 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 1941 | 26,801 | Special 8 | 41-40A | 118 | 3530/3780 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.5 | 115 @ 3500 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 |
| 211,817 | Special 8 | 41-40B | 121 | 3630/3980 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 7.0 | 125 @ 3800 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 92,067 | Super 8 | 41-50 | 124 | 3620/4015 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 7.0 | 125 @ 3800 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 20,768 | Century 8 | 41-60 | 126 | 4093/4239 | 7.00x15 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 7.0 | 165 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 15,732 | Roadmaster 8 | 41-70 | 126 | 4109/4451 | 7.00x15 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 7.2 | 165 @ 3800 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 3,006 | Limited 8 | 41-90 | 139 | 4575/4760 | 7.50x16 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 7.2 | 165 @ 3800 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 1942 | 10,388 | Special 8 | 42-40A | 118 | 3510/3790 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.0 | 115 @ 3500 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 |
| 34,870 | Special 8 | 42-40B | 121 | 3650/3925 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.3 | 125 @ 3800 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 33,034 | Super 8 | 42-50 | 124 | 3800/4025 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.3 | 125 @ 3800 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 4,571 | Century 8 | 42-60 | 126 | 3985/4065 | 7.00x15 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 6.7 | 165 @ 3800 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 8,398 | Roadmaster 8 | 42-70 | 129 | 4075/4300 | 7.00x15 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 6.7 | 165 @ 3800 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 636 | Limited 8 | 42-90 | 139 | 4665/4710 | 7.50x16 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 6.7 | 165 @ 3800 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 1946 | 2,999 | Special 8 | 46-40 | 121 | 3670/3720 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.3 | 110 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 |
| 114,997 | Super 8 | 46-50 | 124 | 3795/4170 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.3 | 110 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 31,399 | Roadmaster 8 | 46-70 | 129 | 4095/4345 | 7.00x15 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 6.6 | 144 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 1947 | 15,414 | Special 8 | 47-40 | 121 | 3720/3670 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.3 | 110 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 |
| 151,759 | Super 8 | 47-50 | 124 | 3795/4170 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.3 | 110 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 77,761 | Roadmaster 8 | 47-70 | 129 | 4095/4445 | 7.00x15 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 6.6 | 144 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 1948 | 24,101 | Special 8 | 48-40 | 121 | 3635/3705 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.3 | 110 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 |
| 101,117 | Super 8 | 48-50 | 124 | 3770/4170 | 7.60x15 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.6 | 115 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| 79,295 | Roadmaster 8 | 48-70 | 129 | 4065/4460 | 8.20x15 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 6.6 | 144 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| Roadmaster 8 (DYN) | 48-70 | 129 | 4065/4460 | 8.20x15 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 6.9 | 150 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | ||
| 1949 | 10,408 | Special 8 | 49-40 | 121 | 3625/3695 | 6.50x16 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.3 | 110 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 |
| 220,165 | Super 8 | 49-50 | 121 | 3735/4100 | 7.60x15 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.6 | 115 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
| Super 8 (DYN) | 49-50 | 121 | 3735/4100 | 8.20x15 | 5 x 5 | In Head | 3 3/32 x 4 1/8 | 248.0 | 6.9 | 120 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | ||
| 86,130 | Roadmaster 8 | 49-70 | 126 | 4115/4490 | 8.20x15 | 5 x 5 | In Head | 3 7/16 x 4 5/16 | 320.2 | 6.9 | 150 @ 3600 | AC 48 | .025 | .015 | 16258374 | ADV mark | -6 | |
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