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80 Performance: the complete guide to more power from your Harley-Davidson UL 80 Performance: the complete guide to more power from your Harley-Davidson UL
Sale Price: $19.95

This is VICTORY LIBRARY's comprehensive booklet on obtaining speed & performance from your Harley-Davidson 74 & 80" flathead 1937-48, including model letters U, UL, UH, ULH, UA, UMG, etc. It's the original, best, and most complete idea source for speed & power from your UL (first published in 1984). It should be your first step to modifying your own motor. These instructions get immediate results, and are easy to follow; no welding or expensive & complex machine work is needed. Your "obsolete" 80" 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 best do-it-yourself literature you can buy to get the most from your Harley-Davidson UL. Before making any decisions about modifying (or even rebuilding) your motor, get the most help available, and do it right the first time. This booklet 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. VICTORY LIBRARY 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 80 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.


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Sidevalve Flathead Cams
Sidevalve Flathead Cams

I have a 1947 Knucklehead I'm confused about the VIN. 47FL85710?

The bike has been in my family about 40 years. I had a friend look at it and he said that the vin was too big

The Engine number was used as a VIN number at that time. 1st 2 digits is the year of manufacture of engine=1947. FL refers to model number code- this indicates a 74 cubic inch overhead valve -knucklehead- Vtwin with standard compression ratio about 6:1 the remaining number are the serial/sequence numbers of engine made of that model. A FLH indicates higher compression 74 Knucklehead with slightly hotter cam timing- about 55 hp instead of 45 hp. The EL would have been the 61 inch model OHV about 35/40 hp. The UL was the 74 Flathead/sidevalve- I rebuilt a 1936 UL years back in back of auto parts shop I worked at- Machinist taught me a lot. ULH was th 80 inch flat head. WL was the 45 inch flatheads, the lighter twin at the time, about 25 hp with the 'High' compression aluminum heads- about 7:1. This engine was made about 1930 and continued until 1970s in the 'Servicar/Trike/Police 3 wheeler used by many police and traffic depts- later designated model G. 1947 about last year for the Knucklehead- 1948 was introduction of 'Panheads' with thicker cylinder walls, oil leaking less top pan covers- I had 1949 FLE and 1954 FLs. Number too big? maybe means 5 digits instead of 4 on serial number? - I'd have to check pattern specs, the addition of a extra trailing number to a engine number or a over thump with the '8' stamp is a known alteration for stolen Harleys - a '3' or '6' over stamped with a '8' is hard to tell from factory- the '6' and '9' had straight legs instead of slight curve but careful setting before hit would obscure that. A '2' or '5' is also easy to over stamp with the '8'. The '8' over stamp on early Harley's is one of things checked on insurance inspections for possible stolen cycles recovered- worked awhile for insurance company and tow company that did repos at times. Some state inspectors catch this , many don't. 1970 about was when Harley changed their numbers to a 'Gothic' type to try to stop thieves from overstamps with hardware store number sets same pattern and size as Harley used previously- this was also about when AMF bought them. Little info for you, ask what friend said he meant by 'too big' .

Written by editor

December 25th, 2002 at 6:45 am

Posted in Vintage Parts

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