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I was given a set of factory heads, but don't know what year these fit. They are Ford heads. The numbers are D50E18. On the ticket that was with them says they replaced #D15B6. Can anyone tell me what years these fit ? Thanks:confused:
 

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Looks like '75-76 302 heads with internal thermactor (smog pump) passages. 58.2cc chambers. 1.78/1.45 valves.
 
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