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Unread 01-14-2008, 03:34 PM   #1
yo-dt
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1978 CJ5 
 
Join Date: Jan 2008
Location: Ixonia,WI
Posts: 11
Jeep 304 heads?

I recently purchased a 1978 CJ5 with a 304 V8. The plugs in it are Champion N-12-Y however the plugs recommended for this engine are Champion RN-14-YC.
These plugs are totally different! Does anyone know what heads I have?
Thanx, in advance, for your response!

yo-dt

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Unread 01-14-2008, 04:56 PM   #2
flashawk
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1979 CJ5 
 
Join Date: Sep 2006
Location: Twain Harte, Ca.
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Have a read here
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1979 CJ5 360 V8 w/Holley 470 Truck Avenger, HEI Ignition, Livewires w/E3 Sparkplugs, Hedman Hedders, Flowmasters, DANA 30 w/Auzzie Locker, AMC 20 limited slip "N" 3:54's, Tuff Country 2.5" lift, Rancho RS5118, Rubicon Express Quick Disconnects, Currie 1/2" lift Heavy Duty Greasable Shackles, DANA 20, T150, Mile Marker PE8000 w/MiFi Controll Box, Bestop Super Top, Warn 6 bolt Premiums, 31x10.50x15
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Unread 01-14-2008, 05:03 PM   #3
krazyzigzagger
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1976 CJ7 
 
Join Date: Aug 2006
Location: Knoxville, TN
Posts: 105
What makes them totally different? They are both 14mm, 3/4" reach, 5/8" hex. The "r" stands for resistor in the R-14-yc. The "c" is for Copper Core. I think the 14 is a slightly hotter heat range.
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Unread 01-14-2008, 05:25 PM   #4
flashawk
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1979 CJ5 
 
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Location: Twain Harte, Ca.
Posts: 688
Well, the resistor is for you're stereo, the copper core is for a hotter spark. The stock gap is .030 thousands. That's about all I know, I'm using splitfires getting ready to try out those E3's.
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1979 CJ5 360 V8 w/Holley 470 Truck Avenger, HEI Ignition, Livewires w/E3 Sparkplugs, Hedman Hedders, Flowmasters, DANA 30 w/Auzzie Locker, AMC 20 limited slip "N" 3:54's, Tuff Country 2.5" lift, Rancho RS5118, Rubicon Express Quick Disconnects, Currie 1/2" lift Heavy Duty Greasable Shackles, DANA 20, T150, Mile Marker PE8000 w/MiFi Controll Box, Bestop Super Top, Warn 6 bolt Premiums, 31x10.50x15
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