Spark plug help - Moparts Forums

Register Log In Moparts Forums Unlawfl's Race & Engine Tech Spark plug help

Print Thread

Spark plug help #2944857 07/19/21 02:29 PM 07/19/21 02:29 PM
Joined: Jun 2013 Posts: 63 Lanse,mi C Canam800 OP member
Canam800 OP member C Joined: Jun 2013 Posts: 63 Lanse,mi	I have a 400 to 526 wedge stroker and was looking for a spark plug recommendation. I’m running Indy ez cnc 295 heads. 11.1 comp with a 275 at 50 duration hydraulic roller cam and a 1050 dominator thumper carb. Also has msd 6al ignition. Street car pump gas. Thanks in advance Brandon

Re: Spark plug help [Re: Canam800] #2944871 07/19/21 03:19 PM 07/19/21 03:19 PM
Joined: Jan 2003 Posts: 31,023 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,023 Oregon	Probably a NGK 7 heat range. I typically use a 6 on the street but your compression is a little higher so I'd go one step colder.

Re: Spark plug help [Re: AndyF] #2944877 07/19/21 03:40 PM 07/19/21 03:40 PM
Joined: Jun 2013 Posts: 63 Lanse,mi C Canam800 OP member
Canam800 OP member C Joined: Jun 2013 Posts: 63 Lanse,mi	What plug # would I order then? Thanks Brandon

Re: Spark plug help [Re: Canam800] #2944879 07/19/21 03:51 PM 07/19/21 03:51 PM
Joined: May 2004 Posts: 12,386 Taxes & Virus's R-US, NY Dragula I Live Here
Dragula I Live Here Joined: May 2004 Posts: 12,386 Taxes & Virus's R-US, NY	Autolite AR3934 hands down...I love those plugs. AR3935 are hot, and AR3933 are cold...34's are right in the middle.... '70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft) https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car) https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car) https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9) '66 Barracuda AWB Stretched nose Blown 440 Car in build stage '71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph https://www.youtube.com/watch?v=Znuo3jMUXTk

Re: Spark plug help [Re: AndyF] #2944885 07/19/21 04:16 PM 07/19/21 04:16 PM
Joined: Jan 2003 Posts: 13,362 Marion, South Carolina [><] an8sec70cuda I Live Here
an8sec70cuda I Live Here Joined: Jan 2003 Posts: 13,362 Marion, South Carolina [><]	Originally Posted by AndyF Probably a NGK 7 heat range. I typically use a 6 on the street but your compression is a little higher so I'd go one step colder. NGK 4091 CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax

Re: Spark plug help [Re: Canam800] #2945028 07/20/21 01:19 AM 07/20/21 01:19 AM
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	Autolite # 3922 or the little hotter 3923 for pump gas with your compression ratio Colder is better to test with first and go from there Both of those plugs are street legal resistor plugs, not the illegal on the street non resistor race plugs I like and use Champion brand, RC9YC should work fine also Last edited by Cab_Burge; 07/20/21 01:20 AM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Spark plug help [Re: Cab_Burge] #2945196 07/20/21 02:11 PM 07/20/21 02:11 PM
Joined: Jun 2013 Posts: 63 Lanse,mi C Canam800 OP member
Canam800 OP member C Joined: Jun 2013 Posts: 63 Lanse,mi	Thanks. Ordered up some NGK to try.

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

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1