I'm running a 320" ford with an Edelbrock 600 carb and the plugs keep carbon fouling. I've leaned out the idle screws and put in smaller jets and needle valves. Can't figure out why it keeps happening . The timing is at 8 degrees before and the dwell is 27. Oh I also went from 45 Autolite plugs to 46s.
Are you using a fuel pressure regulator? My son's carbs did not like anything over 6psi and would push fuel past the needle and seats. Edelbrock recommends one. Posted using the Full Custom H.A.M.B. App!
Driving habits have something to do with that along with possibly firing it up and letting it idle in the driveway for lengths of time without getting out on the road at road speed in the name of thoroughly warming the engine up every few days. Or the twice weekly fire it up and ride across town to the burger joint or cruise night and then put put home at town street speeds never getting the rpm up for a length of time for weeks on end.
I have the 600 Edelbrock with the choke BUT the choke is wired open. Don't need it in the roadster. The engine is mild with just a .030 bore and headers. It's a "T" bucket. It is only driven to our weekly club meetings and a 100 mile cruise a few time a year.
Maybe you need to REALLY drive it. My dad used to call it, "blowing her out". He used to say the reason so many high performance cars, driven by doctors and old lady's, went to shit was because they didn't drive them like they were intended. Get that SOB on the road and DRIVE.
I put E3 plugs in my Roadster. I kept fouling plugs, and these fixed it. http://www.summitracing.com/search?SortBy=BestKeywordMatch&SortOrder=Ascending&keyword=e3
Dialing in the correct heat range on a plug and A/F ratio are two different entities... (a hotter plug doesn't fix a rich mixture). The effect is read on different parts of the spark plug. The dial-in order used by some is first optimizing timing, A/F ratio and finally heat range. I'd set timing at full advance RPM (note:advancing the timing will make a plug run hotter) The below is a good site for reading plugs: Of course the engine has to be at full heat and ideally ran at WOT then shutdown to read the plugs http://www.wallaceracing.com/plug-reading-lm.html
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