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Old 04-28-2019, 02:23 PM   #1
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Workhorse 8.1l spark plugs & wiring

Posting this to confirm which plugs & wires I installed with success in my 2004 Dolphin on a 2003 Workhorse 8.1L Engine. Original plugs looked good after 53,000 miles and were changed out April 2019, after 15 years of service.

Spark Plugs: ACDELCO Iridium 41-101 gap set to .045 (stock is .060)

Spark Plug Wires: ACDELCO 9748KK

OEM is GM 88984269 XREF TO ACDELCO 748KK. The ACDELCO 9748KK does not XREF back to 88984269 but work perfectly. They are approx. 1/2" longer than the originals.

ULTRARVPRODUCTS offers Magnum Spark Plug Wires which apparently are superior to the OEM wires.

btw, all of the original wires were the same length.
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Old 04-29-2019, 06:58 PM   #2
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Quote:
Originally Posted by keninvic View Post

Spark Plugs: ACDELCO Iridium 41-101 gap set to .045 (stock is .060)

.
Was there a reason to change from the OEM plug gap .

JMHO. Smaller gap = spark jumps sooner and colder .
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Old 04-29-2019, 11:48 PM   #3
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Quote:
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Was there a reason to change from the OEM plug gap .

JMHO. Smaller gap = spark jumps sooner and colder .

I think Jon Brazel might know a thing or two...

http://www.irv2.com/forums/f22/8-1l-...ml#post2106421
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Old 04-30-2019, 12:35 PM   #4
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I think Jon Brazel might know a thing or two...

http://www.irv2.com/forums/f22/8-1l-...ml#post2106421
As long as there's good documentation on it .
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Old 05-01-2019, 12:08 AM   #5
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The issue is that the .060 gap opens up too much after a few thousand miles, I have seen reports where they opened up to over .090 within 50,000 miles (I forget the exact amount, it has been a couple of years).
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Old 05-01-2019, 07:24 AM   #6
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The spark takes the path of least resistance. Less stress on the plug wires.
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