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Old 12-03-2007, 07:58 AM   #15
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Chief--

Far be it for me to argue with a former U.S.
Navy Chief Engineer. Thank you for your Service to this Great Country. Heck, the CAPTAIN doesn't
even argue with the Chief Engineer, not if he wants his vessel to be well under way. If you look up the definition of "God in the Engine Room", there is a picture of a Chief Engineer.

Thank you for your post.
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Old 12-03-2007, 08:02 AM   #16
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by T&W:
It has not been my experience that plugs are manufactured pre-indexed. Not any brand with single welded looped ground electrodes. Usually you can do an index of all plugs, without add-on washers if you have two sets to work with. I find it more accurate to file a 45 degree mark on the plug tip inline with the electrode gap. I also don't like the idea of putting "anything" on the porcelein insulator. Lastly, I overgap the plugs by .005". I check my plugs yearly, at least, to acertain firing conditions within the cylinders. This has been my method for years. Good luck!! </div></BLOCKQUOTE>

I would agree with your expierience of welded electrode plugs not being indexed. Also if the plugs did come indexed, how about the cylinder heads, who indexes them?

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Old 12-03-2007, 08:17 AM   #17
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I think Mr.CNC indexes the heads!
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Old 12-03-2007, 01:30 PM   #18
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Brazels RV Performance:
I think Mr.CNC indexes the heads! </div></BLOCKQUOTE>

Mike, who is Mr. CNC? And do these heads come stock on an 8.1 motorhome engine?

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Old 12-03-2007, 10:37 PM   #19
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And Mrs. CNC is building AC Delco spark plugs.
Using the blueprints given to her by her husband.
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Old 12-04-2007, 03:17 AM   #20
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But MRS CNC is Japanese and sends the parts to US for assembly... Say, what! Check your next set of AC Delco's <span class="ev_code_red">41-993's</span> you might be in for a surprise.

Here is an even bigger surprise... Then newly marketed <span class="ev_code_red">41-993's</span> (old 41-932's) are nothing more than NGK PTR4G-15 plugs. Don't believe me... check the stamping on the base. The big difference is the price... AC's cost less - go figure.

On Edit:
Corrected typo on plug number.
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Old 12-05-2007, 02:31 AM   #21
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oemtech,
This coming spring I was going to order new plugs, the plan was to get AC Delco P/N 41-932 per past discussion here on this site.
Do I now want to get 41-933's ??
Thanks.
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Old 12-05-2007, 04:53 AM   #22
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Gregg,

I fixed a typo on the plug number. The 41-932 plug has been replaced by the 41-993. You may see some "old stock" depending on where you buy them. If the dealer moves a lot of spark plugs you will get 41-993's.
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