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What spark plugs to run with my 416 sb #1821709 05/08/15 10:41 AM 05/08/15 10:41 AM
Joined: Feb 2008 Posts: 128 West Michigan 7 76318dart OP member
76318dart OP member 7 Joined: Feb 2008 Posts: 128 West Michigan	I know this question is asked alot but I was wondering what spark plug to run with my combo. It's a 416 with rhs/indy heads about 10:75 compression. Crower solid roller 624/627 258/262 104. It's mostly driven on the street. Right now I'm runningngk's heat range 5. You think I should run a colder plug? Thanks 76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.

Re: What spark plugs to run with my 416 sb [Re: 76318dart] #1821715 05/08/15 10:56 AM 05/08/15 10:56 AM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	I ran Autolite AR3911's in my Edelbrock headed 408, it had 10.9-1 compression and a 260/264 @ .050, .628/.633 flat solid.

Re: What spark plugs to run with my 416 sb [Re: 76318dart] #1821721 05/08/15 11:14 AM 05/08/15 11:14 AM
Joined: Jan 2003 Posts: 4,002 Joplin, Mo R rt66jim master
rt66jim master R Joined: Jan 2003 Posts: 4,002 Joplin, Mo	My 418 has W2's @ 11.2CR. I run RN9YC's

Re: What spark plugs to run with my 416 sb [Re: 76318dart] #1821723 05/08/15 11:26 AM 05/08/15 11:26 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	416 W-2, 10.5 comp, 260/270 .640/.640 I run the Autolite 3923

Re: What spark plugs to run with my 416 sb [Re: MR_P_BODY] #1821726 05/08/15 11:30 AM 05/08/15 11:30 AM
Joined: Feb 2008 Posts: 128 West Michigan 7 76318dart OP member
76318dart OP member 7 Joined: Feb 2008 Posts: 128 West Michigan	Okay thanks. Another question what gap do you run on those plugs? I have Msd ignition. 76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.

Re: What spark plugs to run with my 416 sb [Re: 76318dart] #1821733 05/08/15 11:37 AM 05/08/15 11:37 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Originally Posted By 76318dart Okay thanks. Another question what gap do you run on those plugs? I have Msd ignition. .035

Re: What spark plugs to run with my 416 sb [Re: 76318dart] #1821735 05/08/15 11:39 AM 05/08/15 11:39 AM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	I gap them at .046 with my MSD. Also run a very cold 9 on my 11.25 J head SB.

Re: What spark plugs to run with my 416 sb [Re: 76318dart] #1823994 05/11/15 08:14 AM 05/11/15 08:14 AM
Joined: Feb 2006 Posts: 2,379 MD Kevins493 top fuel
Kevins493 top fuel Joined: Feb 2006 Posts: 2,379 MD	I run a 408 w/ rhs/indy heads, about 10:1, 256@50 .600 lift solid and I also run the 3923s.

Re: What spark plugs to run with my 416 sb [Re: 76318dart] #1824026 05/11/15 11:00 AM 05/11/15 11:00 AM
Joined: Feb 2005 Posts: 20,195 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,195 PA.	3922's in my 408 with pump gas BP 93 but I just bought some 3911's to try since I am now running alcohol. 1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27 Livin and lovin life one day at a time

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