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So I have a good 5.4 3v engine from my 04 f150 xlt and I want to put it in a 01 mustang. I want to put 4v pistons in it to raise the compression ratio a little. What year 4v pistons will fit?

I already removed the heads to get them cleaned and new parts installed. I want to buy cams next wk.
 

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If you’re adding aftermarket cams, you might need valve reliefs. In that case it kind of makes getting 4v pistons pointless. Why not get a set of pistons with 3v valve reliefs?

I guess to answer your question though, the navigator 5.4l 4v’s had flat top pistons and they would work. After all that though, you still have used pistons that could be egg shaped.
 
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