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The Terminator
Engine/Tuning
04 Heads Spark Plug Threads Debate
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<blockquote data-quote="BLK03SVT10TH" data-source="post: 4461001" data-attributes="member: 13915"><p>It would really depend if the threads start at the top of the hole near the seat, or at the bottom of the hole near the chamber. If they start at the top of the hole, there could be 4 or 9 or 20 threads and the spark plug would still screw in the number of threads on the spark plug. </p><p></p><p>Now if the threads are recessed below the spark plug seat, you still can't actually tell by counting the number of rotations how many physical threads there are, but knowing that the depth of the hole is limited and so are the number of threads on the spark plug, you could make a logical assumption that there are only 4 threads there if the spark plug takes 4 rotations to seat.</p><p></p><p>But without pics, its still a crapshoot.</p></blockquote><p></p>
[QUOTE="BLK03SVT10TH, post: 4461001, member: 13915"] It would really depend if the threads start at the top of the hole near the seat, or at the bottom of the hole near the chamber. If they start at the top of the hole, there could be 4 or 9 or 20 threads and the spark plug would still screw in the number of threads on the spark plug. Now if the threads are recessed below the spark plug seat, you still can't actually tell by counting the number of rotations how many physical threads there are, but knowing that the depth of the hole is limited and so are the number of threads on the spark plug, you could make a logical assumption that there are only 4 threads there if the spark plug takes 4 rotations to seat. But without pics, its still a crapshoot. [/QUOTE]
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04 Heads Spark Plug Threads Debate
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