Matching Numbers

In around the mid 1950s, American car manufacturers introduced the VIN, or vehicle identification number, as a means to identify cars and parts. The VIN continues to be the most familiar identification number on cars today, and is found stamped onto the inside driver’s side pillar of the window shield. Today, VINs adhere to an industry-wide standard format, but in many classic cars their format depended on the manufacturer’s preferences.

At the same time, car parts themselves are stamped with identifying numbers which help to indicate manufacturing sequence as well as the facts of the car to which they belong. In some cars, you will find an identification plate that lists the identifying numbers of its major parts. This means you can check each part against this plate to determine if it is correct and original. The identification plate can usually be found either on the engine, transmission, alternator, carburetor, water pump and/or distributor.

To use identifying numbers when selling or buying a classic car often takes some detective work. It is often best to consult a professional, like a classic car mechanic, who can assist you in finding the numbers that you need. You could also try car clubs devoted to the particular model you are looking to buy or sell.

What defines a “numbers matched” car can depend on who you talk to. A purist is likely to assert that a numbers matched car is one in which every stamped part is the original, but for older cars that have been through restorations, that may be near impossible. An alternative definition could be that all parts originate from the same manufacturing run as the original.

Typically, if you find a car claiming to be numbers matched, it will mean at least that the transmission and engine numbers match the chassis VIN, and the differential’s date also matches. When determining the repair and restoration history of a classic car, ask the owner to inform you of matching part numbers; then check these yourself or ask your mechanic to do so.

Numbers matched cars are increasing in value in today’s classic car market. They are naturally rarer and are of course closer to original condition. Determining the status of matched numbers in a car you are buying or selling will help you to determine its true market value.