Cubic Inches vs. Liters

It can often be difficult to compare engine displacements between classic cars, measured in cubic inches, and newer cars, measured in liters.  Since one liter is 1000 cubic centimeters, and there are 2.54 centimeters to the inch, conversion can be done simply with a calculator.

To find liters, divide cubic inches by 61

To find cubic inches, multiply liters by 61

Note that often manufacturers fudge a bit on displacement numbers, and these conversion factors are rounded, so your conversions might not match theirs exactly.

Here are the conversions on some common Mustang engines:

Cubic Inches Liters
170 2.8
200 3.3
250 4.1
260 4.3
289 4.7
302 5.0
351 5.8
390 6.4
427/428/429 7.0

 

Liters Cubic Inches
2.3 140
2.8 171
3.8 232
4.6 281
5.0 305
5.4 329

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