Re: Hotter plug need #
[Re: dafixr]
#2746083
02/24/20 01:43 PM
02/24/20 01:43 PM
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Joined: Aug 2003
Posts: 43,317 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,317
Bend,OR USA
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Is that a stock type iron head with a OEM type spark plug or a 3/4 inch SB type plug with the 5/8 inch socket size? If stock try a Champion RJ10YC or a RJ12YC or a Autolite #84 or 85. If it is the smaller 5/8 socket size with the 3/4 inch reach try the Autolite # 23 or 24 IHTHs
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Hotter plug need #
[Re: Cab_Burge]
#2746090
02/24/20 02:14 PM
02/24/20 02:14 PM
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Joined: Dec 2005
Posts: 11,747 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,747
Fulton County, PA
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NGK R5671-7 crosses to an Autolite 4054. Autolite does a 4055 and 4056 - 1 and 2 steps hotter. Standard non-resistor, 3/4 reach, 13/16 hex. 4056 is equivalent heat to the old 64.
If the results don't match the theory, change the theory.
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Re: Hotter plug need #
[Re: CMcAllister]
#2746120
02/24/20 03:11 PM
02/24/20 03:11 PM
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Joined: Sep 2003
Posts: 422 montana
BANDIT
mopar
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mopar
Joined: Sep 2003
Posts: 422
montana
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Not to get off topic, but is the a site that a guy can go to that shows cross reference on multiple plug manufacturers? I looked the other day and had a real hard time crossing some. Jim
64 Dodge Coronet 440. In progress 1998. Dodge Avenger. 8.35@165. 4400 DA 250” Neil and Parks Slip Joint. 7.36@183. 4600 DA 242" Mullis Dragster. 6.90@ 200mph
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Re: Hotter plug need #
[Re: dafixr]
#2746171
02/24/20 05:51 PM
02/24/20 05:51 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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NGK does make a #6 plug..........Like asked, cyl. head makes all the difference but here's a number that looks like it should work for an aftermarket head....R5674-6 or 4449 stocking number..
Last edited by Thumperdart; 02/24/20 07:07 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: Hotter plug need #
[Re: dafixr]
#2746719
02/26/20 02:11 PM
02/26/20 02:11 PM
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Joined: Aug 2003
Posts: 43,317 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,317
Bend,OR USA
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I don't think you can use a 3/4 reach spark plug with the stock 13/16 plug socket size, I'm almost positive you need to us the smaller 5/8 socket size plugs Champion plug numbers RN9YC versus a RC9YC. Autolite resistor plug # in 5/8 size I use are 3921 and up to 3924 in my race gas motors and the same 5/8 size in non resistor # in retracted gap are 3931 to 3935, 3931 is very cold.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Hotter plug need #
[Re: dafixr]
#2748341
03/02/20 03:53 PM
03/02/20 03:53 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
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One step hotter than a “7”, but they have a projected tip:
BCP6ES
Or
BCPR6ES
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Hotter plug need #
[Re: mopar dave]
#2748989
03/04/20 04:23 PM
03/04/20 04:23 PM
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Joined: Mar 2009
Posts: 2,475 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,475
Sydney,Australia
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for my aluminium head 440s I use a NGK BKR6E
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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