If you believe SHM - some do not - you can find flow data on page 43 of his "How To Build Max-Performance 4.6-Liter Ford Engines" book. For the PI he's got:
Take these with a grain of salt though as some of the other numbers in this book, such as PI chamber volumes and compression ratios appear incorrect (e.g., for chamber volume he says 42cc, the actual spec is 43.9...)
If you believe SHM - some do not - you can find flow data on page 43 of his "How To Build Max-Performance 4.6-Liter Ford Engines" book. For the PI he's got:
Take these with a grain of salt though as some of the other numbers in this book, such as PI chamber volumes and compression ratios appear incorrect (e.g., for chamber volume he says 42cc, the actual spec is 43.9...)