Re: {Chrysler 300} Spark Plugs in 413.

["'John Lazenby' via Chrysler 300 Club International" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>]

I sold NGK for over 40 years and will use no other brand.

John Lazenby 

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On Sun, Dec 11, 2022 at 5:18 PM, John Grady

<jkg@xxxxxxxxxxxxxxxxx> wrote:

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 

Sent from my iPhone

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.

 

Thank you, James

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