| Valve seat and angles, back cutting diagrams. |
| These pics show the relationship between the valve and its seat. Back cutting both the intake and exhaust valves will help flow in all iron Ford BBF sylinder head castings. A back cut on the intake helps primarily at lower lifts. |
| Valve seat angles should be sharp and defined. My machinist leaves the 45 degree seat angle .001 higher than the others to allow for valve to seat properly |