I am currently looking at a 61 xlh, and was a bit misinformed on engine numbers, and models. I know there has been a lot of discussion on what's what around here, so I thought i would pass along this info. Shovithead emailed the link to me, http://www.harley-performance.com/harley-vin.html . If someone is a bit more computer savvy, maybe the text could be downloaded and saved as a sticky to help weed out the facts from bullshit. Thanks again Shovithead.