Ok I would like to know who here on our forum has the most working knowledge of building modular engines. I am specifically looking for somebody schooled in the different series of 4v heads, and their application on the modular blocks, the 03 GT inparticular. Also if any of you have re-built your own 4v heads I would like to talk to you. Thanks for the help

 

this book will help you how to build max performance 4.6 liter ford engines author sean hyland this book also covers the 5.4

 

 

That book is a waste of money.

 

why??? u cant read???

 

I have it its garbage. You can learn more about the heads by searching on the internet for free.
http://sullivanperformance.com/YVS450/tech/tech.htm

 

interesting site, why are the navi heads too big for an n/a mustang 4.6? It just wont make good power or what?

 

You cant use navi heads on a 4.6 because they only came on the 5.4 and the 5.4 intake needed to match those heads will not fit a 4.6. To much flow not enough vacum in a NA 4.6L

 

yeah that link says you can use them with their intake, but only if FI