Joe
Both, actually. #1&6 run lean, so the first place I want to start is the Intake duration on those valves. I have an older Sun engine analyzer that will measure RPM drop across the cylinders, which is crucial for the correct data for before and after analysis. I was hoping to hear good news about higher lift rockers or rollers, funny that hasn't come to fruition yet, but I put a set on a 223 in a 57 F-100 when I was first getting into the classics, they were in a plain yellow box and just plain steel but they were 1.6 High lift and they recommended the oilier kit which plumbed oil thru a capillary tube under the valve cover into the supplied cap which went on the rocker pipe. It worked until the sludge clogged it. It was a road draft engine. Saw an electric system for that just the other day at a swap meet too. It sucked. Literally.
Torker:
The head is Siamesed but the exhaust ports on cylinders #1&6 are not, all intake ports are, exhaust is shared by #2&3 and #4&5 and the stock and Offenhauser 4bbl intake manifolds cause #1&6 to run lean due to central placement of the carburetor (or fuel injection throttle body). The best solution comes in the form of a triple 1bbl setup.
