I just swaped heads on my 455, not because of any problem but because I found a set of Stage 1s. My question is the valves and the combustion chambers are black, sooty, but 4 of the exhaust valves are light grey. They are on cylinders # 1,3,2,4 which are not on the same pairs of runners on the B4B I'm running. If I was a wise man this would light a little light bulb in my little grey cells and I'd know something about was happening in my engine. Is there a wise man out there who can enlighten me?? Dave Berryou:
