The 273-4 puts out 5 more horsepower than a 318 but at 800 more rpm. Now, the 318-2 put's out 80 more ft/lb of torque at only 2400 rpm. The 273-4 put's out it's max. torque at 4000 rpm.
| 1967 283 V8 | 2 barrel | 4 barrel |
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| Gross hp (Valiant) | 180 @ 4,200 | 235 @ 5,200 |
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| Torque (Valiant) | 260 @ 1,600 | 260 @ 4,000 |
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| Bore and Stroke | 3.63 x 3.31 | 3.63 x 3.31 |
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| Compression Ratio :1 | 8.8 | 10.5 |
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| USA specifications | 273 V8 | 318 V8 (LA) | 340 V8 |
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Gross horsepower, 1968
(1962 for 318-A) | 190 @ 4400 | 230 @ 4400 | 275 @ 5000 |
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| Torque, lbs.-ft. , 1968 | 260 @ 2000 | 340 @ 2400 | 340 @ 3200 |
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| Compression ratio, 1968 | 9.0 to 1 | 9.2 to 1 | 10.5 to 1 |
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| Bore, inches | 3.63 | 3.91 | 4.04 |
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| Stroke, inches | 3.312 | 3.312 | 3.312 |
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| Carburetor type (1968-73) | 2-bbl. | 2-bbl. | 4-bbl. |
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| Fuel | Regular | Regular | Premium |
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