I have a set of BB headers that I wish to know the manufacturer. They are white ceramic coated, 2" primary tubes, 3" collector, 4 hole flange. Each tube has its own 2 holed mounting flange. They are on my 66 SS396 with an LS-6 crate engine. I have a very hard time getting at the spark plugs, and there is no way to remove them without taking the engine out. They are a very tight fit! Anyone else have these? I also noticed that the previous owner had to grind down the lip on the top-forward section of each upper control arm, because they hit the headers (when he hit a bump) and put creases in the two front tubes on either side of engine. Rust is starting to permeate through the ceramic. Should I use these? I want 2"tubes, 3" collectors & 3" exhaust, who make the best fit & function (spark plugs) for a 66 Chevelle?