They have both , all good with a tiny very sharp non degradeable tip .
As far as fit just look up cross reference
Probably rock auto has .
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On Dec 12, 2022, at 2:29 AM, Allan Klotz <allan.klotz@xxxxxxxxxxxxxxx> wrote:
Hi
Is it NGK Ruthenium and if so are there a special product number that will fit the 413 engine?
Thanks
Allan
From: chrysler-300-club-international@xxxxxxxxxxxxxxxx [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx] On Behalf Of John Grady Sent: 12. december 2022 02:18 To: James Douglas Cc: Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx) Subject: Re: {Chrysler 300} Spark Plugs in 413.
Best plugs by far today are NGK rhodium tips . Very wide heat range , last 100 k .+ on new cars . A little pricey but worth every cent
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On Dec 11, 2022, at 5:49 PM, 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:
Hello everyone,
I was wondering what people’s recommendation on spark plugs are for the 413? I have the charts and know what the books say. I can also tell you that on my 1940’s flatheads that they run better with plugs that deviate from the direct cross references.
In addition, I have found out that the plug recommendation for city stop and go versus road trip plugs can be different. Since I have not run a V8 in 20 or more years and with all the gas formulation changes, I wanted to ask the group what they have found works well with todays gas in the RB 413 Wedge head engines.
