Spark Plug selection question for 440 - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer Spark Plug selection question for 440

Print Thread

Spark Plug selection question for 440 #827494 10/11/10 07:46 PM 10/11/10 07:46 PM
Joined: Oct 2005 Posts: 90 Central, Indiana M mc4406 OP member
mc4406 OP member M Joined: Oct 2005 Posts: 90 Central, Indiana	Hi, Can someone tell me what plug i need? i have champion rj12yc in it and want a colder plug but not sure which plug would be best?

Re: Spark Plug selection question for 440 [Re: mc4406] #827495 10/12/10 07:00 PM 10/12/10 07:00 PM
Joined: Sep 2010 Posts: 15 Chicagoland JohnnySivilian member
JohnnySivilian member Joined: Sep 2010 Posts: 15 Chicagoland	with champion the higher the number the hotter it is so the next step down would be rj10yc or rj8yc, but those seem to be obsolete. NGK is the opposite with the higher number being colder. In my book, it shows 67-68 440 using xr4 and 69-74 using xr5 which would be one step colder. I hope this helps. What year is the motor? anything fancy like a blower or turbo or 6pak?

Re: Spark Plug selection question for 440 [Re: mc4406] #827496 10/12/10 09:08 PM 10/12/10 09:08 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	RJ11YC or if that's not available cross to the same heat range of another brand. Been a few good reviews for NGK & autolite live every 24 hour block of time like it's your last day on earth

Re: Spark Plug selection question for 440 [Re: mc4406] #827497 10/12/10 10:15 PM 10/12/10 10:15 PM
Joined: Jan 2003 Posts: 5,444 So Cal Sinitro master
Sinitro master Joined: Jan 2003 Posts: 5,444 So Cal	Quote: Hi, Can someone tell me what plug i need? i have champion rj12yc in it and want a colder plug but not sure which plug would be best? Recommend Autolites 85... Just my $0.02...

Re: Spark Plug selection question for 440 [Re: Sinitro] #827498 10/13/10 12:02 AM 10/13/10 12:02 AM
Joined: Mar 2008 Posts: 293 salem, oregon. usa E elmor enthusiast
elmor enthusiast E Joined: Mar 2008 Posts: 293 salem, oregon. usa	I have always used Autolite #85 in all my big blocks. Didn't seem to matter what cam, intake, or exhaust I was running. They all ran perfect.

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1