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45 Performance
The 45 Performance Book

by Jeffrey Diamond

“Harley-Davidson” name for reference purposes only.
Not affiliated with Harley-Davidson Motor Co.


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IBRARY’s comprehensive booklet on obtaining the best speed & power from your Harley-Davidson 45” flathead 1937-73 solo, Servi-Car, military and civilian, including model letters WL, WLA, WLC, G, GE, etc.
    Your “obsolete” 45” side-valve is capable of surprising speed & power, without loss of original appearance or reliability. Over 30 years of research and experience has gone into this booklet. It’s the original, best, and most complete do-it-yourself literature you can buy to get the most from your Harley-Davidson 45. Before making any decisions about modifying (or even rebuilding) 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.
    

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IBRARY is the original source of side-valve performance (since 1971). This information is not reprinted from other articles, magazines, or H-D factory literature and is not available anywhere else.
    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. Revised in 2011.
    Contents are 58 pages of text (over 33,000 words), stapled in paperback to save printing costs, includes the following chapters, some with black & white illustrations, diagrams and charts:
45 Power I·; the original and best idea source for speed & power from your 45 (my oldest & best
    known booklet, in print since 1976 but revised and improved constantly - this is the 2008
    version). It should be your first step to modifying your own motor. These instructions get results,
    and are easy to follow; no welding or expensive & complex machine work is needed.
45 Power II·; the next step for even more power, for fast street use or building a replica racer;
    explains many techniques used by experts 50 years ago.
45 strokers; details on installing long-stroke flywheels to build a 900cc motor, selecting
    components, where clearancing is necessary, calculating skirt lengths, piston compression
    distances, adapting commercially-available pistons, or constructing a “short-rod” 45
    stroker motor using S&S flywheels, modified std. pistons and Sportster rods, more.
Relieving the 45; a general discussion of relieving the cylinders & heads for better flow and more
    effective combustion, plus detailed specific instructions to help you plan & complete reliefs
    on your std. 45 for better performance.
Porting the 45; instructions for improving the 45’s breathing capacity, both intake and exhaust,
    from the valve seats to the port opening, for all standard cylinders 1936-73.
Factory hot parts; the only detailed guide to H-D factory speed equipment for the 45 &
    K-Model motors, gives part #s, data on original use, measurements, interchanges between
    models, how to identify WLD, WLDR, WR & K/KH/KR parts such as heads, manifolds, rods,
    cylinders, crank-pins, cams, & cam covers by casting numbers, dimensions, more.
Cams; selecting, modifying, re-timing and installing.
Flywheel weight; how it affects performance.
Big valves for the 45; complete instructions to easily install high-quality, inexpensive, reliable
    auto parts for more top end power; diagrams show how to modify your exhaust valves for
    better flow, too.
45 motor data chart; gives exact dimensions and running clearances, etc.
45 bore & stroke chart; gives engine size for all bore oversizes & stroker flywheels.
45 sprocket ratio chart; gives ratio and speed for all motor sprockets.
45 transmission ratio charts; give ratios and RPM loss, as well as tooth counts etc. for
    pre-war and late std., special & WR close-ratio transmissions.
45 racing specs chart; clearances, end-play, settings, dimensions, etc. for high-performance
    engine assembly of 1937-73 standard motors.
Service tips; many useful shop short-cuts and hints.
Good numbers?; some ideas on decoding VIN numbers, detecting alterations etc.
Z rotor; a simple breather timing modification.

    Please note: this is not a “coffee table book”, it is intended to be a research tool for those who seriously want to improve their 45 engines. It is not a repair manual. If your bike won’t start, float bowl leaks, spark plugs foul, &c. my booklet will not help you. It does not contain information on tune-ups, or explain how to remove, disassemble, clean or restore the bike. If you do not already have this information do not buy this booklet. If your engine is stock and you’re pleased with how it runs now, this booklet is not going to be of much use, although you might find it interesting.
    “45 Performance” does not include any 80, Linkert, Mikuni, 45 Magnum or British transmission information, please order these separately: Click here for other Victory Library booklets on the 45 & 80 flatheads.

New: get this booklet plus “The Linkert Book” at reduced price, click here: Click here to purchase both books at once, and save money.


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Harley, H-D, Harley-Davidson, 45, 750, flathead, sidevalve, flat-head, side-valve, flat head, side valve, stroker, increase, performance, relieve, relief, port, racing, speed equipment, WL, book, article, power, race, KNS, speed, big valve, hot cam, obsolete, racers, racing, trike, WR, Victory, panic, Diamond