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.... www.nology.com