Re: [MV] Correct Spark PLugs for DUKW/CCKW

From: Steve & Jeanne Keith (
Date: Tue Feb 04 2003 - 14:07:35 PST

If the R is for Resistor, take them back!

If you run resistor plugs you will have sub-par performance with the
rest of the components!

I have a 'used' set. Run only 5 miles....

Steve AKA Dr Deuce

----- Original Message -----
From: <>
To: "Military Vehicles Mailing List" <>
Sent: Tuesday, February 04, 2003 3:47 PM
Subject: [MV] Correct Spark PLugs for DUKW/CCKW

> According to TM 9-802, the technical manual for the DUKW-353, the DUKW
should use an AC type "44 or 44 Com." with the gap set at .025" or .030"
respectively. I went to a local auto parts store and they looked it up in
the AC/Delco manual and said the GMC 1941-1945 trucks should use a R43 spark
plug, so I bought six of them. Now, I'm wondering, what gap to use. Also,
I'm not sure if it matters or not, but the DUKW normally operates at about
8,000 feet, and tends to run rich. I intend to advance the timing some, but
I'm not sure if I should adjust the gap for this or not. Any help is
greatly appreciated.
> Rob Kiser
> 1945 DUKW-353
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