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Best Spark plug for 509 mopar cam 440+6 ???? #1395742 03/01/13 07:52 PM 03/01/13 07:52 PM
Joined: Aug 2003 Posts: 2,792 IN Dartman928 OP master
Dartman928 OP master Joined: Aug 2003 Posts: 2,792 IN	Need some suggestions what plug to use in a 440+6 509 mopar cam 10:1 ported 906 head engine Going to be street only. Thank you

Re: Best Spark plug for 509 mopar cam 440+6 ???? [Re: Dartman928] #1395743 03/01/13 08:36 PM 03/01/13 08:36 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	I always ran Champion RJ12YC. worked great!

Re: Best Spark plug for 509 mopar cam 440+6 ???? [Re: Dodgem] #1395744 03/01/13 09:21 PM 03/01/13 09:21 PM
Joined: Apr 2003 Posts: 959 Cincinnati,Ohio J jcastle1 super stock
jcastle1 super stock J Joined: Apr 2003 Posts: 959 Cincinnati,Ohio	Champion J12Y is the best I've found. Last edited by jcastle1; 03/02/13 10:38 AM.

Re: Best Spark plug for 509 mopar cam 440+6 ???? [Re: Dartman928] #1395745 03/01/13 09:42 PM 03/01/13 09:42 PM
Joined: Aug 2003 Posts: 43,157 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,157 Bend,OR USA	Quote: Need some suggestions what plug to use in a 440+6 509 mopar cam 10:1 ported 906 head engine Going to be street only. Thank you I would look at and use both the Autolite 74 or #AR73 or # 84 or 83(Autolite resitor plugs with the asme heat range as the 73 and 74), if available, and the Champion RJ10YC Colder heat range is better when using a iron head and pump gas like your talking about Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Best Spark plug for 509 mopar cam 440+6 ???? [Re: Cab_Burge] #1395746 03/01/13 10:17 PM 03/01/13 10:17 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I used Autolite 74's in my old 906 headed .557 cammed 440. Ron

Re: Best Spark plug for 509 mopar cam 440+6 ???? [Re: Dartman928] #1395747 03/01/13 10:33 PM 03/01/13 10:33 PM
Joined: May 2005 Posts: 6,446 NJ-USA H HPMike master
HPMike master H Joined: May 2005 Posts: 6,446 NJ-USA	Best option is use NGK R5670-5...I use these NGK series plugs in all builds and they offer them in multiple heat ranges for diff applications , cr, etc. Yep, they are Japanese, but very high quality. MB

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