Visit The Dirt Forum for More Information

Author Topic:   What spark plugs to use?
posted February 03, 2004 08:37 PM
I wondered what everyone uses for spark plugs?

IMCA stock car... 350cfm Holley carb. Basically a stock 350 with vortec heads.

posted February 03, 2004 09:06 PM
I've been running ar 135 in ford windsor jr. heads I think there about the same as r43 ac plug.

posted February 04, 2004 10:48 AM
AR 134's in 041 heads (around 10:1 with flattops)
AR 133's in 601 heads (11+:1)
AR 72's in 461 heads (10:1)

Those seem to work pretty well. The 133's are a little on the cold side and you have to watch how long it idles. Some people like to let a car warm up by letting it idle (800-950rpm) for 10 minutes. With 133's they'll foul pretty quickly like that. I held it up to 1500-1800 while warming it up and they came out a white/gray color after 2 months of racing.

posted February 04, 2004 04:24 PM
Thanks for the help.

posted February 06, 2004 02:05 PM
And then there's Silverstone plugs....

Yep, we tried them all too....

Kinetic Performance

Back to the Archives