hot or cold plugs
#2031294
03/14/16 11:39 PM
03/14/16 11:39 PM
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Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
rowin4
OP
master
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OP
master
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
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What are you guys using for spark plugs that have big blocks with Edelbrock RPM Performer heads?
it's ok to butt heads, just don't do it with a butthead
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Re: hot or cold plugs
[Re: rowin4]
#2031485
03/15/16 08:36 AM
03/15/16 08:36 AM
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crabman173
Unregistered
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crabman173
Unregistered
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NGK has the best tech line in the business--call them and they will put you dead on like a Nascar crew chief
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Re: hot or cold plugs
[Re: rowin4]
#2031640
03/15/16 01:56 PM
03/15/16 01:56 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
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I Live Here
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Posts: 19,317
State of confusion
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I`m at 12.1.1 comp. and run a 7 or 8 NGK`s depending on my tune. The 7 can speckle a bit if the engine temps up there and the tune isn`t.............. 
Last edited by Thumperdart; 03/15/16 01:57 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: hot or cold plugs
[Re: rowin4]
#2031648
03/15/16 02:07 PM
03/15/16 02:07 PM
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Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
rowin4
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OP
master
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
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It's a 505 pump gas engine with Edelbrock RPM heads. The reason I asked is I have been running Autolite AR3924's , a friend of mine runs Autolite AR3933's. I don't recall why I have been running these plugs or if I should be running something different. SO?
it's ok to butt heads, just don't do it with a butthead
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Re: hot or cold plugs
[Re: rowin4]
#2031649
03/15/16 02:09 PM
03/15/16 02:09 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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I only run NGK`s so not sure on those..............
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: hot or cold plugs
[Re: rowin4]
#2031655
03/15/16 02:22 PM
03/15/16 02:22 PM
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Joined: Aug 2003
Posts: 43,129
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,129
Bend,OR USA
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The 3933 are non resitor and I think a retracted gap. The 3924 are a resitor with a extended gap, the 3933 is one step colder than 3924. IHTH
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: hot or cold plugs
[Re: rowin4]
#2031772
03/15/16 05:09 PM
03/15/16 05:09 PM
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Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
rowin4
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OP
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Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
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OK, so should I run a resistor or non resistor plug with MSD ignition?
it's ok to butt heads, just don't do it with a butthead
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Re: hot or cold plugs
[Re: rowin4]
#2031808
03/15/16 06:15 PM
03/15/16 06:15 PM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
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usa
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try the 3924 resister plugs first. if they're too warm step down to a 3923. msd's have to have resistance in the system; whether it's the wires, ballast or plugs, or combination. an ap3924 has 5000 ohns, regular 3924 7000 ohms; tested some rc12y's at 70,000 ohms! most resistor plugs will be 5000 or more ohms. of course non-resistor should be zero. if you're by-passing the ballast then more resistance will need to be in the plugs and wires.
Last edited by lewtot184; 03/15/16 06:17 PM.
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Re: hot or cold plugs
[Re: lewtot184]
#2031836
03/15/16 07:26 PM
03/15/16 07:26 PM
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Joined: Jul 2005
Posts: 1,770
Wethersfield,CT
Ray440
top fuel
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top fuel
Joined: Jul 2005
Posts: 1,770
Wethersfield,CT
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NGK recommends the following plugs for Edelbrock heads.
R5672A-7 is a non resistor race plug. -7 is the hottest plug they offer. -11 is the coldest one. This is a projected tip spark plug. Use R5671 for domed pistons.
BCPR6ES is a resistor type street plug.(Stock #6779) This is what I currently use on my 383 Road Runner with MSD ignition. These are available in heat ranges 4 thru 9
1969 Plymouth Road Runner 440 auto
2017 Ram 1500 Quad Cab 5.7 Hemi
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Re: hot or cold plugs
[Re: rowin4]
#2031839
03/15/16 07:39 PM
03/15/16 07:39 PM
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Joined: Jul 2005
Posts: 1,770
Wethersfield,CT
Ray440
top fuel
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top fuel
Joined: Jul 2005
Posts: 1,770
Wethersfield,CT
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OK, so should I run a resistor or non resistor plug with MSD ignition? According to MSD website either will work just fine but you should use resistor type plugs for less radio interference if that is a concern.
1969 Plymouth Road Runner 440 auto
2017 Ram 1500 Quad Cab 5.7 Hemi
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Re: hot or cold plugs
[Re: MR_P_BODY]
#2031877
03/15/16 09:00 PM
03/15/16 09:00 PM
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Joined: Oct 2009
Posts: 1,267
North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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I'm using the 3924 in my 416 injected engine  I have been running a AR3933 plug and was thinking about running one a step hotter. Which one would that be a AR3932 or AR3934.
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: hot or cold plugs
[Re: rowin4]
#2032106
03/16/16 01:38 AM
03/16/16 01:38 AM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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I ran ar3934 in my 493 for years. Probably the same plugs as I dont change them. I tried ngk and champions at DW12 and went back to the ar3934 very quickly
Gen 3 power 6.22@110, 9.85@135
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Re: hot or cold plugs
[Re: D-50]
#2032120
03/16/16 01:47 AM
03/16/16 01:47 AM
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Joined: Aug 2003
Posts: 43,129
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,129
Bend,OR USA
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I'm using the 3924 in my 416 injected engine I have been running a AR3933 plug and was thinking about running one a step hotter. Which one would that be a AR3932 or AR3934. On Autolite plugs the smaller the number the colder the plug, 3934 are the next hotter from the 3933 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: hot or cold plugs
[Re: Ray440]
#2032303
03/16/16 12:16 PM
03/16/16 12:16 PM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
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Posts: 5,161
CT
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OK, so should I run a resistor or non resistor plug with MSD ignition? According to MSD website either will work just fine but you should use resistor type plugs for less radio interference if that is a concern. Do you have a link? Everything I see on their website says not to run a non-resistor plug, resistor plugs only with MSD.
Last edited by GTX MATT; 03/16/16 12:17 PM.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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