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post #1 of 7 Old 08-20-2008, 08:59 PM Thread Starter
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Spark Plugs

I'm just curious about what spark plugs some of you guys are using. I have a 347 with Victor Jr. heads. I run high 10's going threw the traps at 7100rpm. I occasionally have the problem of burning the tip of a plug. I was told it was because they were cheap passenger car plugs that should not be in a race engine (Champions). What plugs and heat ranges are you guys racing with a 347 with Victor Jr. heads using?


'79 Fairmont [email protected], 347, Victor Jr. heads, Victor Jr. intake, Dart block,C4, 750cfm Bigs carb,9inch 4:56 Detroit Locker. No power adders.
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post #2 of 7 Old 08-20-2008, 10:22 PM
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not a 347, but I use the autolite AR3923 plugs. They are autolite "race" plugs. never had any good luck with champions in a ford.


91 notch, 408W, 10.5 comp, Jay Allen cam, Crane linkbars, Scorpion rockers, vic jr intake/heads, Canton pan, Mac longtubes, C4, UPR adj. uppers/lowers, Strange struts/shocks, subframe connectors, wild rides 6pt, Team Z k-member/anti-roll bar, MSD ignition.
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post #3 of 7 Old 08-21-2008, 12:36 AM
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Used to run Accels and burnt a lot of them up. NGK's now and no problems at all.

It's Old....Not Slow.
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post #4 of 7 Old 08-21-2008, 12:58 AM
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I run Autolite 3924's on a set of Canfields. Go through the traps at 7700. I have to richen it up a little as my plugs were a little to white for my liking.

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post #5 of 7 Old 08-21-2008, 10:51 AM
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TFS, Edelbrock, and AFR Heads:
[14mm, 3/4" Reach, 5/8" Hex, gasket seat]
AUTOLITE
1 step colder--3924 (4) [*recommended starting point]
2 step colder--3923 (3)
-----AR3933 (3) [*recessed tip, racing plug]
-----AR3932 (2) [*recessed tip, racing plug]
-----AR3931 (1) [*recessed tip, racing plug]

NGK
1 step colder--(FR5) 3686 (5) [*recommended starting point]
2 step colder--(BKR6EY) 3696 (6)
-----(R5671A-8) 4554 (8) [*recessed tip, racing plug]
-----(R5671A-9) 5238 (9) [*recessed tip, racing plug]
-----(R5671A-10) 5820 (10) [*recessed tip, racing plug]

MOTORCRAFT
1 step colder--AWSF22C
2 step colder--AWSF32C



My 347 is similar to yours...only I'm FI. I run autolight 3924's n/a...3923's on the spray. They work good for me..and are cheap. Plus just about every autoparts store carries them..heck even walmart does.


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Boss block Big bore 347/225 TFS HP's/SR/BW S476R/A2W/PG/FAST xfi on E85
5.33 at 134.9 on 26x8.5 in 1/8th @3380#
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post #6 of 7 Old 08-21-2008, 08:08 PM Thread Starter
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Thanks for the feedback guys. Going to try the Autolites this weekend.

'79 Fairmont [email protected], 347, Victor Jr. heads, Victor Jr. intake, Dart block,C4, 750cfm Bigs carb,9inch 4:56 Detroit Locker. No power adders.
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post #7 of 7 Old 08-21-2008, 08:16 PM
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I run 3925's on my 14-1 VicJr setup. Go thru the traps at 7600.

SBF 347
[email protected] N/A
[email protected] S480
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