Re: Spark Plug reccomendation's 440
[Re: 1974 474 Duster]
#2722923
12/10/19 12:03 PM
12/10/19 12:03 PM
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Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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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
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Re: Spark Plug reccomendation's 440
[Re: 1974 474 Duster]
#2722975
12/10/19 02:18 PM
12/10/19 02:18 PM
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Joined: Aug 2003
Posts: 43,124
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,124
Bend,OR USA
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Autolite #75,74 or # 85,84. Champion RJ10YC, RJ12YC or R12Y or R10Y if you can find those last two part numbers still  Not sure on the current NJK part #s  10.5 to 1 compression ratio with iron heads is a gamble on detonation with todays pump fuel, be careful on the tuning  Colder plugs are usually needed also, like Autolite #73 or #83, Champion RJ6 or colder also 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Spark Plug reccomendation's 440
[Re: Lee446]
#2723557
12/12/19 08:13 PM
12/12/19 08:13 PM
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Joined: Jan 2003
Posts: 4,712
Moved to N.E. Tennessee
GomangoCuda
master
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master
Joined: Jan 2003
Posts: 4,712
Moved to N.E. Tennessee
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Not to hijack, but in this application are there any equivalents that use a 5/8" hex plug for header flange clearance? Not that I am aware of. 1974 474 Duster - in a similar engine I use NGK 3332. Also known as XR5. I have never fouled a plug. I think it would idle until it ran out of gas. Lol. Of coarse Your results may vary depending on state of tune. Hint - with that cam it will like 18-20 deg advance at idle.
Last edited by GomangoCuda; 12/12/19 08:39 PM.
In theory, there is no difference between theory and practice. In practice, there is.
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