David Vizard’s How to Port & Flow Test Cylinder Heads. Author Vizard explains how the enthusiast needs to shape the combustion chambers and smooth out ports for maximum performance. Of key importance, he shows how to optimize flow paths through the heads, past the valves, and into the combustion chamber. It covers blending the bowls, a most basic porting procedure, but it also covers pocket porting, porting the intake runners, and many advanced procedures. These advanced procedures include unshrouding valves, porting a shortside turn from the floor of the port down toward the valve seat, and developing the ideal port area and angle. All of these changes combine to produce optimal flow velocity through the engine for the maximum power. Porting heads is an art and science. It takes a craftsman’s touch to shape the surfaces of the head for the optimal flow characteristics and the best performance. Porting demands the right tools, skills, and application of knowledge. Few other engine builders have the same level of knowledge and skill porting engine heads as David Vizard. All the aspects of porting stock as well as aftermarket heads in aluminum and cast-iron constructions are covered. Vizard goes into great depth and detail on porting aftermarket heads. Starting with the basic techniques up to more advanced techniques, you are shown how to port iron and aluminum heads as well as benefits of hand and CNC porting. You are also shown how to build a high-quality flow bench at home so you can test your work and obtain professional results. Vizard shows how to optimize flow paths through the heads, past the valves, and into the combustion chamber. The book covers blending the bowls, a basic porting procedure, and also covers pocket porting, porting the intake runners, and many advanced procedures. All of these changes combine to produce optimal flow velocity through the engine for maximum power. In certain terms, the more air your cylinder head flows, the more horsepower your engine can make. Porting cylinder heads allows you to flow more air and unlock hidden performance potential. As a result, you can extract significant horsepower and torque gains. To port heads, it takes a craftsman’s touch to shape the passages of the head for the most efficient airflow and effective combustion of the fuel charge. To verify this work, you need to flow test the heads on a flow bench. In this ground-breaking book, porting master and engine building wizard David Vizard covers all the nuances of porting heads and how to build an affordable flow bench to test the results. Porting cylinder heads is an art and a science. It’s like sculpting a piece of clay into a glorious final form and, therefore, it demands the right tools, skills, and application of knowledge. With 50 years of experience and uncommon acumen, David Vizard explains the principles, philosophy, and techniques for extracting maximum performance from cylinder heads. All the aspects of porting stock and aftermarket heads in aluminum and cast iron are covered. Vizard explains how to optimize flow paths through the heads, past the valves, and into the combustion chamber. He covers blending the bowls, pocket porting, unshrouding the valves, porting the intake runners, and many other advanced procedures. If you’ve always wanted to port your heads but didn’t have information to confidently obtain the best results, now you do. David Vizard is a revered engine builder and acknowledged Chevy big-block engine expert, which is why GM contracted him to develop several engine packages for the Chevy big-block crate program. He has authored more than 30 highly respected engine-building and automotive titles, penned about 4,000 magazine articles, and contributed scores of web articles to popular sites. Often referred to as “Vizard the Wizard, ” his work is often the subject of blogs and editorial pieces in popular automotive magazines. He currently owns and runs an engine research and development business in Charlotte, North Carolina. Table Of Contents: About the Author 4 Acknowledgments 6 Introduction 7 Chapter 1: What It Takes to Make Power 14 Point of Maximum Flow 15 Seat and Port Priorities 15 Do You Need a Flow Bench? 16 Chapter 2: Flow Testing Procedures 18 The Standard Pressure Drop 18 Real-World Test Pressures 21 Corrections 21 Floating Pressure-Drop Testing 22 Intake Fixation? 38 Six Wet-Flow Mistakes to Avoid 40 Chapter 5: Porting Aftermarket Heads 47 Air Flow Research 48 Dart 49 Edelbrock 51 EngineQuest 54 Racing Head Service 54 Trick Flow Specialties 55 Chapter 6: Porting Tools, Consumables and Safety 67 Eye and Lung Safety 67 Grinders–Air or Electric 68 Carbide Cutters 69 Support Porting Tools 69 Sourcing Consumable Supplies 74 Chapter 7: Five Golden Porting Rules 79 Rule Number 1 80 Rule Number 2 80 Rule Number 3 80 Rule Number 4 81 Rule Number 5 81 Chapter 8: Developing Functional Ports 82 Valve Seat Forms 82 Working Valve Seat Shapes 83 Alternative Seat Angles 84 Seats on Valves 87 Valve Shapes 87 Clearances and Temperatures 89 Cutting Valve Seats 91 Chapter 9: Valve Shrouding 96 Practical De-shrouding 97 Chapter 10: Developing Functional Heads 100 Optimizing Cylinder Head Airflow 100 Valve and Flow 101 Ports 101 Cross-Sectional Area 103 Port Velocity 105 Applied Basic Porting 108 Compression Increase 113 Modified 170s on the Dyno 113 The Virtual Flow Bench 114 Chapter 11: The Combustion Process 124 Defining Combustion 124 Combustion Efficiency 126 British Touring Car Championship Year 129 Finally: The Chambers 131 More Combustion Curiosities 132 Atomization Optimization 133 Thermal Barriers 135 Swirl and Quench 135 More Thermal Management 137 Small Crevice Volume–Big Consequences 138 Conclusions 143 Chapter 12: Maximizing Compression Ratio 144 Thermodynamics Made Easy 146 Dynamic Compression 148 Intake- to Exhaust-Valve Ratios 153 Containing the Pressure 157 Source Guide 158. Author Vizard covers blending the bowls, basic porting procedures, as well as pocket porting, porting the intake runners, and many advanced procedures. Advanced procedures include unshrouding valves and developing the ideal port area and angle. Unlock Your Engine’s True Power with David Vizard’s Expert Cylinder Head Porting Techniques. Place of Publication North Branch. Country of Publication United States. Short Title DAVID VIZARDS HT PORT & FLOW T. AU Release Date 2012-02-23. NZ Release Date 2012-02-23. US Release Date 2012-02-23. UK Release Date 2012-02-23. We’ve got this. At The Nile, if you’re looking for it, we’ve got it.