Small Block Factory Ford 289 / 302 Cylinder Heads
The Ford 289/302 heads were available with many different valve sizes. We have reworked several sets of these heads for applications where no porting is allowed. Stock air flow intake is 166 cfm. With “UnderCover Porting” the intake side is improved to 190 cfm. The same 1.780″ intake valve was used in each test. On the exhaust side improved from 124 cfm to 137 cfm with “UnderCover Porting”. The valve size for the exhaust was 1.450.
See also: Complete Cylinder Head Assemblies