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As several have said, by the time you get the heads cleaned and machined, screw in studs, new valves, springs and retainers, you will have spent enough to get some new aluminum heads.

I did port a set of 78 t bird 302 heads once and picked up about three tenths over a bone stock set.

The best iron heads for a 302 or 351 seem to be the iron GT40s or the GT40p heads from a late Explorer.

The iron gt40s, with a supporting cast, took a second of the quarter time.
 

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craigerGTA,
I have a used set of 69-70 Windsor heads, professionally ported ( 235cfm intake flow) studs, guides, guide plates, S/S 1.94 x1.60 valves , flat tappet springs / retainers. These were on a road race engine and have not been abused or blown up. They could be run as is or have the valve job freshened. $600 plus shipping. The owner is changing classes to one that allows aluminum heads is the only reason for the sale.
Randy
 
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