I found these 2 PDF’s on the internet while searching for more information on my 18 HP B&S motor.
The first document is an Illustrated parts list for Briggs & Stratton Model Series 422700 Type numbers 1105 – 4822.
The second document will show you how to read the model number / VIN number of your Briggs & Stratton motor so you will know which motor will directly replace your motor. Its easier to find an engine that will fit than it is to find the exact same model engine if you need to change the engine for any reason. The screenshot to the right shows a preview of the Briggs & Stratton Model Number Designations, This is a great document for help with Briggs & Stratton engine decoding. Some people may also refer to this document as a Briggs & Stratton Model Decoder.
Note: The PDF file is higher quality than the sample image to the right.