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The cubic inches of the engine in a NASCAR race car must be the same as the cubic inches of the street car engine they represent. (you can't get a V8 engine in a Camry so the previous line is false.) Other than that there is virtually nothing similar between a NASCAR engine and a street car engine.

Most street cars today use advances in fuel efficiency such as fuel injection, electronic ignition and a host of sensors and vacuum control to help keep pollutants low. NASCAR race cars still use the tried and true technologies of a bygone era such as carburetors and distributors. Also, most of the engine options for the street cars these race cars are modeled after use overhead camshaft (OHC) and a front wheel drive configuration, whereas the race car engines use overhead valves (OHV) and a rear wheel drive configuration. However is is important to point out many sports cars and larger vehicles (trucks, vans, SUV's) still use OHV engines and real wheel drive.

NASCAR engines even run on leaded fuel still. A NASCAR engine can cost over 1 million dollars to build.

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Q: How are NASCAR engines different from engines in street cars?
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