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White Diamond '03 DHS (with DTS floor shift)
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86,325 Posts
Why do you ask? The reason I ask this is because if you are replacing HG's, you need to use the coarser pitch thread in the "Bigsert" Timesert kit or Norm's NS300L inserts or Northstar Performance stud kit, which is also a coarser thread pitch.
Whatever you do, DO NOT use the original thread pitch, even with the original Timesert kit.
All that said, I don't recall the original thread pitch, but I'm sure someone will and post it shortly.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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67,262 Posts
The correct kit for inserts will have the correct bolt thread (the inner threads) for the year engine used. You MUST use new GM head bolts - and they are found by year in RockAuto.

Factory head bolt specs are found in the correct year service manual for that car. www.alldatadiy.com.
 
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