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Author Topic:   Spark Plug? for Gasoline
Dirt Freak

Total posts: 238
posted February 11, 2005 05:33 AM  
I'm running a 355 with Dart heads, MSD 6T and Billet Dist. Approx 12:1 comp. 750 DP Holley and 110 oct fuel. What is a good plug to start with? Thanks, Dave

Dirt Freak

Total posts: 254
posted February 11, 2005 05:48 AM  
I believe Dart calls for the Autolite 133? I could be wrong although, I thought I seen it in some of their literature.

I can afford the plugs, I can't afford the heads.....or atleast to lose them. LOL

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Dirt Forum Champ
Total posts: 578
posted February 11, 2005 05:52 AM  
we use an ngk r5674-8. works good for gas motors.


Dirt Freak

Total posts: 238
posted February 11, 2005 06:04 AM  
I can't afford the heads, either. I just got a good deal on a used set.

Dirt Freak

Total posts: 229
posted February 11, 2005 11:05 AM  
this plug is a 14mm tapered seat with .460" of reach-perfect for Dart heads.
autolite racing plugs, gap them at .035" or less due to the cut back electrode, any more gap and the spark will not be consistent.
This is a good starting point for heat range.

Hope this helps

Dirt Maniac

Total posts: 145
posted February 11, 2005 10:11 PM  
Delco #R44TS . . . never a problem. Changed every 4 to 5 races.
Forgot, use these with HEI dist.

[This message has been edited by mdsteacher (edited February 11, 2005).]

Dirt Forum Champ
Total posts: 934
posted February 12, 2005 03:30 PM  
The Autolite AR133 is what we use in the Iron Eagles, on gas.


Hendren Racing Engines
Rutherfordton , NC

Dirt Freak

Total posts: 238
posted February 16, 2005 06:46 AM  
I'll start with the AR133. Thanks to everyone for the help! Dave.

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