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how do i go about finding out what kind of heads that i have, they were in my garage with a couple of ford blocks and i konow the guy was a 5.0 mustang guy, what i'm getting at is if i could use these on my 1974 351w to make some more hp. i found some casting marks, in no particular order,T58, 9K19, E?TE, 19758 arranged in a circle

thanks

marty
 

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Look up E7 (or E7TE) heads on Google. They are standard issue heads on 5.0 from 1987 to circa 1990's.
 

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i'll never grow up
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for eg: 1968 302 heads have 58cc chambers (E7s are 64-66),
I would have gt40p valves installed 1.94 intake and 1.5 exhaust, the exhaust "smog bump" removed and the head bolt holes drilled to accept either 302 or 351 windsor head bolts. The smaller chambers and larger valves along with the ported exhaust will likely create a substantial HP gain over the stock E7TEs.
 
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