This is

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IBRARY’s comprehensive booklet on obtaining the best speed & performance from your classic BSA “M20” 500cc or “M21” 600cc single.
    Your “obsolete” side-valve engine is capable of surprising speed & power, without loss of original appearance or reliability. It's the most modern and complete do-it-yourself literature you can buy to get the most from your M20. Before making any decisions about modifying your motor, get the best help available, and do it right the first time. This book is not a repair manual, but goes far beyond into fine tuning, improvements and modernization. Use it with your service manual for best results. Not an expert mechanic? You'll still find many improvements you can make yourself with common hand tools.
    This booklet addresses only the 1946-63 engines, although the information and comments are generally applicable to Norton Model H and similar big side-valve engines.
    I guarantee that you’ll find information in this booklet you’ve never seen before, and that will help you plan and complete your project.
    Consider this: if this booklet saves you from making even a single mistake or bad purchase, or gives you one new idea, doesn’t that make this purchase worth while? The price is a small fraction of what you will invest in the motor - plan more intelligently, and get better results.
    Stapled in paperback to save you printing costs, includes the following chapters, some with black & white illustrations, diagrams and charts: Bore & stroke chart; gives engine size for all bore oversizes and stroker flywheels.
Strokers; details on installing alternate stroke flywheels such as M21, selecting components, where
        clearancing is necessary, calculating piston compression distances, skirt lengths, much more.
Cam choices; listing part numbers, duration, overlap, lobe center angle, lift etc. for many BSA factory
        and aftermarket high-performance cams, with comments on selection.
Porting; improving the existing ports, and creating a new updraft intake port.
Cam phasing; how the power curve of an engine can be altered by changing the position(s)
        of the cam gears etc.
Building a short-stroke 500cc motor; for vintage racing.
Cylinder head improvements; including pop-up, valve reliefs, etc.
Lightening and improving valve gear; with diagrams.
Stronger valve springs; choices and requirements.
Transmission ratio chart; gives ratios and RPM loss, as well as tooth counts of all factory
        gearsets for the 4-speed transmission.
Transmission ratio selection; how to pick the best choice for your racing format.
Installing a 5-speed; in the original transmission cases.
Conversion to overhead valve; using both factory BSA parts, and components adapted
        from other brands.
Adapting a supercharger; selection of model, choices, types of drive, required mods, etc.     Please note: this is not a coffee table book, or a repair manual. It is intended to be a research tool for those who seriously want to improve their M20 engines. I assume that you either are, or have a good working relationship with, an experienced mechanic. If your bike won’t start, float bowl leaks, spark plugs foul, &c. my booklet will not help you.

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