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Can anyone tell me about the 2 extra holes in the end of these heads? I think that they were for egr set up. I am putting it in a 64 so no need. There appears to be a screw in plug in them. Not a rookie, just no knowledge of these heads. Thanks
 

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A few years back I ported a set off a 1990 5.0. With a stage 1 trick Flow cam, value springs and the porting there was a very good improvement in performance . Very cheap upgrade. roger
 
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