Each year thousands of people, going on instinct and a modicum of skill, build high-performance V-twin motorcycle engines with aftermarket parts. Unfortunately, instinct isn’t always a reliable guide--and more often than not these custom-built engines lack the power to perform. With Harley in his blood and a lifetime of building to draw on, American Iron editor Chris Maida is able to provide the guidance these bikers need. In this book Maida offers expert and clear step-by-step instructions for constructing a V-twin motorcycle engine that will deliver awe-inspiring performance and fool-proof reliability. From purchasing parts and putting them together to installing and maintaining a V-twin engine, this guide is the critical tool for building over-the-top V-twin horsepower.