Spark Plug reading?
I was wondering if you guys could take a look at these plugs and tell me what you see needs adjusting. I'm confusing myself. There are a couple that are black and the rest are brown like you see in the pic. #3 was dry at the tip, but a little wet on the threads (fuel). All other plugs were pretty much dry. Should I go a step hotter on the plugs. These are a new set of plugs That I put in after I adjusted A/F on the carb for highest vaccum. The only thing I've done different after that was change the module out in my HEI. By the way this is a brand new 496 that I'm still working the bugs out of. I started to get a slight surge when I stop at the light, which is what made me check the plugs. I checked for vac leaks also before I pulled the plugs to see if that was causing the slight surge. The carb is a Holley 4150 850cfm double pumper. Any advice is appreciated! Thanks,