| Valve seat and angles, back cutting diagrams. |
Re in "Car" nation High P e r f o r m a n c e |
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| 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 |