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The Terminator
Engine/Tuning
04 Heads Spark Plug Threads Debate
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<blockquote data-quote="BurnTire" data-source="post: 4463370" data-attributes="member: 22078"><p>Photos</p><p><a href="http://www.highperformancestangs.com/forums/showpost.php?p=11949&postcount=84" target="_blank">http://www.highperformancestangs.com/forums/showpost.php?p=11949&postcount=84</a></p><p></p><p>The 4 thread heads have the same seat, but only have 4 threads from the combustion chamber up.</p><p></p><p>Number of turns is how you tell. If someone says other wise they have never had a set of heads 03 and 04 in their hands.</p><p></p><p>Basically there is a seat in the head for the wider portion of the plugs just above the threads to stop on. This seat, notch, ledge, whatever you want to call it is in the same location in the 03/04 heads. What is different is the 03 head threads start at the bottom of the head and go up 4 threads then there is space between there and the seat.</p><p></p><p>The 04 heads threads start at the same spot, but go up 9 threads much closer to the seat.</p><p></p><p>So when you screw a plug in your are using the bottom 4 threads of the plug on an 03 head and the bottom 9 plug threads on an 04.</p><p>Most plugs have 10-11 threads.</p><p></p><p>So this is how to find out how many threads your head has.</p><p>Make full 360 degree turns on the plug</p><p></p><p>4-4.5 turns to remove or seat the plug on a 4 thread head </p><p></p><p>8-8.5 turns to remove or seat the plug on a 9 thread head</p><p></p><p>This isn't a guess. This was tested on a set of 03 and 04 heads that were taken off of their respective cars.</p><p></p><p>I personally did the 04 head test and Dan at Performance Solution in Phoenix did the 03 set.</p><p></p><p>This is the outright facts. If anyone says other wise we can take a video.</p></blockquote><p></p>
[QUOTE="BurnTire, post: 4463370, member: 22078"] Photos [url]http://www.highperformancestangs.com/forums/showpost.php?p=11949&postcount=84[/url] The 4 thread heads have the same seat, but only have 4 threads from the combustion chamber up. Number of turns is how you tell. If someone says other wise they have never had a set of heads 03 and 04 in their hands. Basically there is a seat in the head for the wider portion of the plugs just above the threads to stop on. This seat, notch, ledge, whatever you want to call it is in the same location in the 03/04 heads. What is different is the 03 head threads start at the bottom of the head and go up 4 threads then there is space between there and the seat. The 04 heads threads start at the same spot, but go up 9 threads much closer to the seat. So when you screw a plug in your are using the bottom 4 threads of the plug on an 03 head and the bottom 9 plug threads on an 04. Most plugs have 10-11 threads. So this is how to find out how many threads your head has. Make full 360 degree turns on the plug 4-4.5 turns to remove or seat the plug on a 4 thread head 8-8.5 turns to remove or seat the plug on a 9 thread head This isn't a guess. This was tested on a set of 03 and 04 heads that were taken off of their respective cars. I personally did the 04 head test and Dan at Performance Solution in Phoenix did the 03 set. This is the outright facts. If anyone says other wise we can take a video. [/QUOTE]
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