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Re: What sparkplug for 440 source heads
[Re: Dave64]
#1906282
09/04/15 01:27 PM
09/04/15 01:27 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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What combo and compression? I run only NGK`s cos they`re easier to get a full reading on and live well street/strip and for my 12.1.1 comp. 470 w/alum heads I run a # 7 or 8. 7`s stay a bit cleaner and 8`s are colder for full boogie blasts if engine temps are above 180-190.
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: What sparkplug for 440 source heads
[Re: Dave64]
#1906283
09/04/15 01:27 PM
09/04/15 01:27 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Need more info.. street or strip, compression and what fuel.... but autolite 3924 is a decent number.. thats the full strap.. they offer the race version also which starts with a "R" which is a short strap
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Re: What sparkplug for 440 source heads
[Re: Dave64]
#1906330
09/04/15 02:45 PM
09/04/15 02:45 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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Maybe a 12yc champion then...............
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: What sparkplug for 440 source heads
[Re: Dave64]
#1906702
09/05/15 02:39 AM
09/05/15 02:39 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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Trying to help get info on what plug to use with a set of 440 source big block heads. What do you run? What is the part number for Champion and Autolite? Thanks for the help in advance! For my 10:1 compression street car with Stealth Heads, these seen to work good: NGK #2756 plugs (Plug Part # BKR6E-11) which is a 6 Heat range. The Plug part # breaks down as: BK = 14mm thread, 5/8" Hex ISO Type (shorter ceramic part) R = Resistor Plug. 6 = Heat Range. E = 3/4" Thread Reach. -11 = Spark Plug Gap of 0.044" The #2 plug is pretty close to the inner fender on my Coronet, so I also use the special Snap-On spark plug tool: https://store.snapon.com/Hand-Sockets-So...ex-P644223.aspx
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Re: What sparkplug for 440 source heads
[Re: GY3]
#1907264
09/06/15 01:47 AM
09/06/15 01:47 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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I used Champion RC12YC in mine and they worked perfectly! When I crossed referenced the RC12YC to NGK it lists several heat range 5 and 6 plugs, including the BKR6E that I'm using, so I think the heads like the hotter spark plugs. I orginally had cooler "8" heat range plugs and they fowled when the weather got coolder, that is why I went to the hotter plugs.
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Re: What sparkplug for 440 source heads
[Re: Dave64]
#1907487
09/06/15 03:31 PM
09/06/15 03:31 PM
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Joined: Aug 2003
Posts: 43,744 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,744
Bend,OR USA
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For a low compression pump gas motor with those heads i would start with either the Champion RC12YC or the nextstep hotter one, if champion offers them On Auotlites thier # 3325 will probaly work okay also
Last edited by Cab_Burge; 09/06/15 03:32 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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