Informative read.

I have been porting heads for high performance Harley engines, after reading this book, I have learned many procedures and bits of information that has led to increased flow and horsepower for my customers.

Tons of information. I am going to have to read it again to try to make since of it. The pictures do not show clear before and after changes. I had a hard time following the changes that were to be made. There was a lot of nomenclature that I did not understand and I am spending a lot of time on the internet looking up terms surrounding headjobs.

Excellent information in an easily readable and understandable format. Definite focus on naturally aspirated and carbureted applications. Few examples of specific EFI or boosted technology. For me it was well worth the purchase.

Vizard is legendary for being able to put complex technical topics down clearly on paper in an understandable way and this book is no exception. Many technical writers merely state things based on their training and experience. And those statements may be 100 percent accurate. Vizard takes the extra steps to show you the proof that comes from his objective testing. If you are a geek like me, you will devour every word of this book like it was your first meal after a three day fast. I wished for a little "more" on the topic but know there is a level past which this can't be taught without hands-on experience. Consider this book a primer for someone in preparation for gaining some specific experience. There is no "one size fit's all" when it comes to porting so it really can't be taught generically. I'm sure Vizard could have taught how to port a particular head and given us one of his secret recipes for that head but that recipe wouldn't translate to another head. The bottom line here is that if you expect this book, or any other, to show you how to port any head for fun, profit and mondo horsepower with no more than a die grinder, you will be disappointed. While you can successfully make minor improvements that are beneficial, you can't get into the "Big Leagues" without a flow bench, a small array of precision tools and a few extra heads to experiment on.