Engine size can affect performance, the amount of gas used and the value of a vehicle. When replacing an engine, it is also important to know the engine size. There are many places to find the engine size on a vehicle. The size of the engine may often be found in a raised or etched marking somewhere on the engine. If this marking is not available, there are other ways of determining the engine size.
Find the engine size by looking at the cars manual. You can often look to the table of contents in the manual to pinpoint the section with engine specifications listed.
Look for engine size as part of the engine description on the emissions decal. The emissions decal can be found on the interior of the hood, on the radiator core support or on the box that holds the air filter in place.
Write down the VIN of the vehicle. Most numbers and letters that make up a VIN, tell something about the vehicle, including the size of the engine. Go to a Website, such as K&N Part Search by VIN, which will interpret the VIN and display the engine size.
Research the engine size, using NADA Guides or KBB. By entering the year, make and model of the vehicle, you can browse the results for your particular vehicle. Possible engine sizes for your vehicle will be listed.