My apology for assuming that yall are mind readers, but I was hoping hear about a specific brand name and specific plug # and heat range that you are running and why. My combo is street/strip situation. It's a new motor/9.5:1 hyper flat tops/351W heads - big valves. I'm wanting to find a substitute for the old Motocraft/Autolite BF 32 (possibly a shade cooler???). that maybe is comparable to this plug since they are getting harder to find.
backdft21 - it sounds like your combo is pretty close to mine. I'll research the # for it's heat range. Anybody using NGK's plugs on an iron 351W head w/MSD? The book called for a #WK5 or something like that to cross with Autolite or Motorcraft's BF42, BF32 and BF22 plugs. This is quite a long span of heat ranges for 1 plug to cover!!! It doesn't make sense, at least to this idiot.
We do not have a preference to spark plug brand, brand of choice. We do offer a starting point to get you started COMPRESSION SPARK PLUG GAP up to 10.5:1 0.050"-0.060"
above 13.0:1 0.035"-0.045"
Open gap in 0.005" increments until best performance is obtained. The only thing we do recommend is to stay away from "hype plugs".
From: [mailto:[email protected]]
Sent: Saturday, May 18, 2002 4:28 PM
To: Joe LaPille; Joe LaPille
Subject: Spark Plugs
I have a MSD billet distributor and MSD 6 box on my 302
Ford engine. I can tell that I am getting an extremely
hot spark out of this setup. My question is this, what
specific spark plug should I use in conjunction with
This is the recommended plug for a 89 GT Mustang, and that is what I used to determine what to use for my early stang with those heads. The heads are the same unles you have an early 351 head with the bigger valves. I made 282 HP with this engine combo with those plugs.