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Spark plug recommendation - switching from points to electronic

Started by madmike, April 25, 2011, 09:53:41 AM

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madmike

April 25, 2011, 09:53:41 AM
'68 Charger, supposedly fresh stockish 440 with a small cam, aftermarket aluminum intake, Holley mechanical secondary carb, original cast iron heads (can't remember if '915's or '906's).  I've just nearly completed converting my engine wiring harness from original points ignition, to the Mopar Direct Connection aftermarket ignition system (the 'orange' box).  This engine has never been fired, yet.

What spark plug would be recommended to run in this engine, and what plug gap?  Thanks!

Mike

BigBlockSam

#1
April 25, 2011, 10:12:30 AM
 :popcrn:
I won't be wronged, I wont be Insulted and I wont be laid a hand on. I don't do these things to others, and I require the same from them.

  [IMG]http://i45.tinypic.com/347b5v5.jpg[/img

Just 6T9 CHGR

#2
April 25, 2011, 12:17:37 PM
NGK XR5 with a .035 gap :thumbs:
Chris' '69 Charger R/T

resq302

#3
April 25, 2011, 01:07:06 PM
Quote from: Just 6T9 CHGR on April 25, 2011, 12:17:37 PM
NGK XR5 with a .035 gap :thumbs:

Yup, I concur with Chris!
Brian
1969 Dodge Charger (factory 4 speed, H code 383 engine,  AACA Senior winner, 2008 Concours d'Elegance participant, 2009 Concours d'Elegance award winner)
1970 Challenger Convert. factory #'s matching red inter. w/ white body.  318 car built 9/28/69 (AACA Senior winner)
1969 Plymough GTX convertible - original sheet metal, #'s matching drivetrain, T3 Honey Bronze, 1 of 701 produced, 1 of 362 with 440 4 bbl - auto

Chryco Psycho

#4
April 25, 2011, 02:13:18 PM
I use the Champion RJ12YC gapped at .35 with a stock coil or .040 with a high output coil

BigBlockSam

#5
April 25, 2011, 05:54:56 PM
Quote35 with a stock coil or .040 with a high output coil

:yesnod: you also need a hp set of wires if your gonna open up the gap  :cheers:
I won't be wronged, I wont be Insulted and I wont be laid a hand on. I don't do these things to others, and I require the same from them.

  [IMG]http://i45.tinypic.com/347b5v5.jpg[/img

firefighter3931

#6
April 25, 2011, 11:42:10 PM
Quote from: resq302 on April 25, 2011, 01:07:06 PM
Quote from: Just 6T9 CHGR on April 25, 2011, 12:17:37 PM
NGK XR5 with a .035 gap :thumbs:

Yup, I concur with Chris!

Same here....the XR5's are an excellent choice  :2thumbs:


Ron
68 Charger R/T "Black Pig" Street/Strip bruiser, 70 Charger R/T 440-6bbl Cruiser. Firecore ignition  authorized dealer ; contact me with your needs

resq302

#7
April 26, 2011, 05:43:06 AM
Quote from: firefighter3931 on April 25, 2011, 11:42:10 PM
Quote from: resq302 on April 25, 2011, 01:07:06 PM
Quote from: Just 6T9 CHGR on April 25, 2011, 12:17:37 PM
NGK XR5 with a .035 gap :thumbs:

Yup, I concur with Chris!

Same here....the XR5's are an excellent choice  :2thumbs:


Ron

What do you mean same here!  You're the one who told me and probably told Chris also!   :lol:
Brian
1969 Dodge Charger (factory 4 speed, H code 383 engine,  AACA Senior winner, 2008 Concours d'Elegance participant, 2009 Concours d'Elegance award winner)
1970 Challenger Convert. factory #'s matching red inter. w/ white body.  318 car built 9/28/69 (AACA Senior winner)
1969 Plymough GTX convertible - original sheet metal, #'s matching drivetrain, T3 Honey Bronze, 1 of 701 produced, 1 of 362 with 440 4 bbl - auto

tan top

#8
April 26, 2011, 07:01:41 AM
Quote from: Chryco Psycho on April 25, 2011, 02:13:18 PM
I use the Champion RJ12YC gapped at .35 with a stock coil or .040 with a high output coil

:yesnod:  me too 35 thou &  & rj12yc

remember reading about opening them up to 40 thou  years ago !! & then forgot all abouty it !!  till  you mentioned this  :coolgleamA:

what HO coil ((any specific))  do you  need to do this ?? do you need to change the ballast resistor  also


Feel free to post any relevant picture you think we all might like to see in the threads below!

Charger Stuff 
http://www.dodgecharger.com/forum/index.php/topic,86777.0.html
Chargers in the background where you least expect them 
http://www.dodgecharger.com/forum/index.php/topic,97261.0.html
C500 & Daytonas & Superbirds
http://www.dodgecharger.com/forum/index.php/topic,95432.0.html
Interesting pictures & Stuff 
http://www.dodgecharger.com/forum/index.php/topic,109484.925.html
Old Dodge dealer photos wanted
 http://www.dodgecharger.com/forum/index.php/topic,120850.0.html

firefighter3931

#9
April 26, 2011, 10:18:38 AM
Quote from: resq302 on April 26, 2011, 05:43:06 AM
Quote from: firefighter3931 on April 25, 2011, 11:42:10 PM
Quote from: resq302 on April 25, 2011, 01:07:06 PM
Quote from: Just 6T9 CHGR on April 25, 2011, 12:17:37 PM
NGK XR5 with a .035 gap :thumbs:

Yup, I concur with Chris!

Same here....the XR5's are an excellent choice  :2thumbs:


Ron

What do you mean same here!  You're the one who told me and probably told Chris also!   :lol:


You're probably right Brian...i've been pushing that plug for pump gas/stock cylinder head builds for years.  :lol:


Ron
68 Charger R/T "Black Pig" Street/Strip bruiser, 70 Charger R/T 440-6bbl Cruiser. Firecore ignition  authorized dealer ; contact me with your needs

Just 6T9 CHGR

#10
April 26, 2011, 07:24:15 PM
Quote from: resq302 on April 26, 2011, 05:43:06 AM
Quote from: firefighter3931 on April 25, 2011, 11:42:10 PM
Quote from: resq302 on April 25, 2011, 01:07:06 PM
Quote from: Just 6T9 CHGR on April 25, 2011, 12:17:37 PM
NGK XR5 with a .035 gap :thumbs:

Yup, I concur with Chris!

Same here....the XR5's are an excellent choice  :2thumbs:


Ron

What do you mean same here!  You're the one who told me and probably told Chris also!   :lol:

Yup Ron did just that....just spreading his good word!  ;)
Chris' '69 Charger R/T

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