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Discussion Starter · #1 ·
What years if any of the 5.4l 4v engines have 4 thread spark plug holes? I have a 2002 navi 4v 5.4l engine and I'm hoping i don't have to swap heads because this engine is getting twins and i don't want to worry about spark plug blow out. I have not been able to find any definitive information about these engines and that issue. Any help is greatly appreciated.
 

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Yes, there could be any head on it so it doesn't matter what you read you have to look to see what you got to be sure of what you ended up with. ;)

ks
 
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