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Old 07-13-2016, 10:13 AM   #1
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PI head question

Will a set of 1999 PI heads work with my 2004 Mustang GT? Pretty sure one of mine is junk after the cam install and my buddy has a set off his 1999 that he did a 4V swap on.

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Old 07-13-2016, 11:41 AM   #2
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Yes. You will need the valve covers too as they will be 13 hole instead of 11 like your Romeos. You'll also be going to the 4 thread spark plug holes vs the 8 in your 2004 heads. This is fine if your friend actually used a torque wrench and anti seize when he did his plugs.


You also might need new hardware for your timing cover but the cover itself will line right up.
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Old 07-13-2016, 12:09 PM   #3
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Scotty do 2003 GT heads have 4 or 8 thread?


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Old 07-13-2016, 12:46 PM   #4
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Quote:
Originally Posted by rdwelch View Post
Scotty do 2003 GT heads have 4 or 8 thread?


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Most will be 4 thread, they switched over late in the MY.
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