the Holley is the same carb that was used when it was on the dyno. these plugs are black and sooty. I tried to post a pic but the camera didn't get a good shot. I may try later. have to get ready to bowl this morning. I mean these plugs are caked with soot. I personally think that 850 is too much carb. I may when I get back from Cruisin the Coast slap on my 650 Thunder series carb and check it out. I called Jegs and the tech guy said 750 CFM would be great on there. But who knows. I am going to order a set of plugs and put them in anyway. just thought they weren't burning the fuel properly.
