This book from Wolfgang Publications shows the how and why of performance engine building with over 500 color photos.

**Not a what-to-buy-book - it's a how-to-build book.** Each chapter covers a specific subassembly of the Twin-Cam motor. The reader can pick and choose what chapters they need at the time, whether it's:
Porting a set of heads
Installing cams
Assembling a flywheel assembly

For anyone planning to build or rebuild a Twin Cam that combines power with durability, this book walks the reader through two complete assemblies. The crew at R&R Cycles shows how they do a big-bore top-end job in the chassis, as well as build a complete bad ass 124 engine assembled on the bench.

Take advantage of the skill and knowledge shared by the crew at R&R Cycles - builders of everything from hot street engines to full competition motors that set records at Bonneville and the strip. If you're a rider who takes pride in doing most your own work, this is a book you need. From a simple rebuild to a complete motor built from scratch, the how-to information and photo sequences you need are right here.

Harley-Davidson Twin Cam Hop-Up & Rebuild Manual: 144 pages, 500+ photos.