difference in plug wires.. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-18-2007, 10:02 AM   #1
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Putting in plugs and wires on my 1999 SE, looks like the latest and greatest genuine GM wires are 746DD. Also seems like they supercede 766E and others. Not looking for high performance here, just factory goodness.. Can get a set of the older wires, but brand new, on ebay... much cheaper. Also, from the factory, looks like the car didn't come with iridium plugs, but now that'* what the part store suggests.. again, this was superceded.. I'm looking at about $100.00 for plugs and wires if I go with the latest and greatest, I'm wondering if I can use the older stuff, at a fraction of the cost. Were there everyday driving issues with the older stuff? Thoughts? Thanks, Mike
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Old 09-18-2007, 12:36 PM   #2
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I'd wait for an authority to chime in on this, but to the best of my knowlege, the most common plug wire comes from Napa. Belden Premiums. Reasoning, they have a lifetime warranty, so if/when they go bad, you go back to napa and get a free replacement. I can't tell you with any certainty on the plugs, but NGK TR-55 is mentioned a lot. Autolites are also used.(605 or 606'*? I think it'* the latter for stock, but wait and find out.)

Like I said, I'd wait for a real authority to chime in and verify this information.
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Old 09-18-2007, 12:50 PM   #3
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As Doug stated, get the Napa Premium Beldins, they are dark blue in color, cost around $50 and have a lifetime warrenty. I run them, along with most of the veterans around here.

I would suggest getting Autolite spark plugs, easily available at Wal-Mart for CHEAP

Quote:
Originally Posted by INTENSE-Racing
Use the Autolite® 605 spark plugs (one heat range colder than stock) if you have a 3800 Series II or III engine engine with up to 6 pounds of boost. At this level, we recommend reducing the spark plug gap to .055", or .035" with nitrous oxide.
Use Autolite® 104 spark plugs (two heat ranges colder than stock) if you have a 3800 Series II or III engine with 6 to 12 pounds of boost. At this level, we recommend reducing the spark plug gap to .050", or .035" with nitrous oxide.
Use Autolite® 103 spark plugs (three heat ranges colder than stock) if you have a 3800 Series II or III engine with 12 to 18 pounds of boost. At this level, we recommend reducing the spark plug gap to .045", or .035" with nitrous oxide.
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Old 09-18-2007, 02:09 PM   #4
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Vet #1 that doesn't love the Napa Beldens after seeing a guy need a receipt and his original box to get new wires.

I run AC Delco wires. Buy them at Advance Auto aka Parts America/Checkers for $45 with a lifetime warranty and factory part. No receipt needed because they put your phone number to the warranty.

I've also used Autolite Professionals with the same warranty etc.

The only thing I have against the Napa'* is in some applications they don't seem to fit right and the warranty being too strict
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Old 09-23-2007, 11:40 AM   #5
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I would replace yours with all AC Delco replacement parts.
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