High Port® 225 cylinder heads for small block Ford are specifically designed for large cubic inch, large power adder, big shot nitrous oxide, and other mega-power combinations. These heads share many of the same exclusive features of High Port 192 “Fast As Cast” heads—unique valve spacing, raised exhaust runners, extra strong castings, thick decks, superior cooling, reshaped intake runner entries, extra material for porting, raised valve cover rails, and excellent airflow—plus top-of-the-line CNC Competition Ported runners with a high resolution surface finish for maximum airflow and power over the entire rpm range.