Re: {Chrysler 300} Spark Plugs in 413.

[Dyke Ridgley <ridgleyracing65@xxxxxxxxx>]

I also have XR5 in my 300F. However, If you check with NGK, they cross reference the "standard" 413 motors to XR4 plugs (one heat range hotter). For how most of the cars are used today, this plug should be fine, and still provide plenty of "heat range" for some hard running. In the day, Chrysler expected the "letter cars" to be used considerably harder than the standard models,and spark plugs had much narrower heat ranges. In over 30 years of dyno testing, I have learned two important things, most people run too cold a spark plug, and engines need less fuel than you think.

Dyke Ridgley

Ridgley Racing

5500 Walmsley Rd

Decatur, IL 62521

 

217-865-2300 p

217-865-2309 f

 

 

On Mon, Dec 12, 2022 at 7:49 AM Noel Hastalis <cpaviper@xxxxxxxxxxx> wrote:

Here are the NGK plugs I’ve been running in my 300-F -

Noel 

Sent from my iPhone

On Dec 12, 2022, at 6:34 AM, John Grady <jkg@xxxxxxxxxxxxxxxxx> wrote:

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 . 

Sent from my iPhone

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 

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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