Reworking The 4.6 Two-Valve Cylinder Heads
The stock valves have well shaped heads. The intake valve from this used head had a fairly large deposit of cooked oil on its back side. This oil fouling happens during cold start up,when most engines have a little blow-by that condenses on the back of the valves. This condensation is then baked in place once the motor heats up. Over a period of time, this buildup will cut down on the motor’s breathing.
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