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Spark plug recommendation #2881391 01/28/21 04:40 PM 01/28/21 04:40 PM
Joined: Feb 2013 Posts: 146 Missouri R randavis OP member
randavis OP member R Joined: Feb 2013 Posts: 146 Missouri	I'm having a 512 RB being built. It will be using Edelbrock Performer RPM heads and a Comp hydraulic roller cam. Eagle rotating assy. What spark plugs are you guys running in this kind of combo? Thanks 74 Challenger, bought it new. In 1978 I replaced the original 318 with a 446 and 727. Mild cam, Jardine headers, and Holley Sniper EFI. New engine! 511" RB, Edelbrock Performer RPM heads, Eagle rotating assy, Comp hyd roller cam, Doug's 2" headers.

Re: Spark plug recommendation [Re: randavis] #2881404 01/28/21 04:58 PM 01/28/21 04:58 PM
Joined: Jan 2003 Posts: 31,052 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,052 Oregon	NGK 6987 https://www.ngk.com/ngk-6987-zfr6f-11g-v-power-spark-plug Last edited by AndyF; 01/28/21 05:00 PM.

Re: Spark plug recommendation [Re: randavis] #2881423 01/28/21 06:08 PM 01/28/21 06:08 PM
Joined: Aug 2003 Posts: 43,251 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,251 Bend,OR USA	What compression ratio and what quality of fuel will you be using? Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Spark plug recommendation [Re: Cab_Burge] #2881451 01/28/21 08:03 PM 01/28/21 08:03 PM
Joined: Feb 2013 Posts: 146 Missouri R randavis OP member
randavis OP member R Joined: Feb 2013 Posts: 146 Missouri	Originally Posted by Cab_Burge What compression ratio and what quality of fuel will you be using? Compression in the 10-1 range. 91 octane no ethanol. 74 Challenger, bought it new. In 1978 I replaced the original 318 with a 446 and 727. Mild cam, Jardine headers, and Holley Sniper EFI. New engine! 511" RB, Edelbrock Performer RPM heads, Eagle rotating assy, Comp hyd roller cam, Doug's 2" headers.

Re: Spark plug recommendation [Re: randavis] #2881461 01/28/21 08:59 PM 01/28/21 08:59 PM
Joined: Jan 2003 Posts: 3,684 South San Francisco, Ca 70sixpkrt master
70sixpkrt master Joined: Jan 2003 Posts: 3,684 South San Francisco, Ca	https://www.ngk.com/ngk-4930-bcp6es-nickel-spark-plug [img]http://www.imgur.com/hxlGUJt.gif[/img] 4-speed 3:54 Dana 13.01 @107.93 with street tires (not hooking up)

Re: Spark plug recommendation [Re: randavis] #2881490 01/28/21 10:58 PM 01/28/21 10:58 PM
Joined: Aug 2003 Posts: 43,251 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,251 Bend,OR USA	I like to use extended tip spark plugs when I can, on your deal look either NGK 6 or 7 with the extended tips, Autollite #3924 or 3923, Champion RC12YC or the colder RC9YC if you tune it to run clean at idle and light part throttle cruise Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Spark plug recommendation [Re: Cab_Burge] #2881715 01/29/21 01:29 PM 01/29/21 01:29 PM
Joined: Jul 2004 Posts: 653 Fredericksburg Va P plycuda mopar
plycuda mopar P Joined: Jul 2004 Posts: 653 Fredericksburg Va	I buy my ngk plugs from Rock Auto about half the price of summit. paid 1.50 a plug

Re: Spark plug recommendation [Re: Cab_Burge] #2881768 01/29/21 04:01 PM 01/29/21 04:01 PM
Joined: Feb 2013 Posts: 146 Missouri R randavis OP member
randavis OP member R Joined: Feb 2013 Posts: 146 Missouri	Originally Posted by Cab_Burge I like to use extended tip spark plugs when I can, on your deal look either NGK 6 or 7 with the extended tips, Autollite #3924 or 3923, Champion RC12YC or the colder RC9YC if you tune it to run clean at idle and light part throttle cruise I have to have resistors because of the Sniper EFI. 74 Challenger, bought it new. In 1978 I replaced the original 318 with a 446 and 727. Mild cam, Jardine headers, and Holley Sniper EFI. New engine! 511" RB, Edelbrock Performer RPM heads, Eagle rotating assy, Comp hyd roller cam, Doug's 2" headers.

Re: Spark plug recommendation [Re: randavis] #2881786 01/29/21 05:23 PM 01/29/21 05:23 PM
Joined: Jan 2003 Posts: 3,684 South San Francisco, Ca 70sixpkrt master
70sixpkrt master Joined: Jan 2003 Posts: 3,684 South San Francisco, Ca	BCPR6ES [img]http://www.imgur.com/hxlGUJt.gif[/img] 4-speed 3:54 Dana 13.01 @107.93 with street tires (not hooking up)

Re: Spark plug recommendation [Re: randavis] #2881852 01/29/21 09:14 PM 01/29/21 09:14 PM
Joined: Aug 2003 Posts: 43,251 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,251 Bend,OR USA	All the ones I listed, except the NGK heat range, are resistor plugs with extended tips Using resistor plugs with resistor wires make the coil firing voltage thresh hold go up, making it have a hotter spark Same thing as widening the plug gap Last edited by Cab_Burge; 01/29/21 09:17 PM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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