Re: [Amc-list] 4.0 spark plugs

[Tom Jennings <tomj@xxxxxxx>]

On Tue, 20 Mar 2007, adm@xxxxxxxxxxxx wrote:

> I used to post to this list a few years back.  I still have the same
> car, a 1973 AMC Gremlin X.  The car has been more or less sitting for
> years, and now I'm trying to put it back into semi-regular service.  I
> have a quick question: Does anyone have a part number for spark plugs
> one heat range hotter than stock for a 4.0 head?  I'm running a 4.0
> head on a 4.2 block and am having trouble with the plugs fouling.
> Thanks.

Hey Dan!

There's only one hotter, and it's RC9YC. There's no 11, 10.

http://wps.com/temp/plugs-rc12lyc-rc9yc-autolite685.jpg

It also has a longer reach, but it does work just fine in a
stock 83 258. If you google that part number, you'll see a
bunch of 4.0 and Viper chatter (same plug).


It might not be until 28 Mar or so before the photo appears.

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