| chambers. That boss around the plug is right up next to the edge of each valve. Upon opening of the valve, this boss is in the way of the airflow and it produces a bit of restriction as the air has to flow around it. When you remove the boss, you should use non-turbo (non-projected tip) plugs which do not protrude as far into the combustion chamber. The idea is to get as much interference away from the in/out flowing gases of the combustion chamber. Analogously, at the edges of the valves out near the periphery of the combustion chamber come really close to the combustion chamber which also causes some degree of restriction. By grinding some material and smoothly 'radiusing' the combustion chamber between the valve and the chamber periphery, you improve the flow of gases. This process is called de-shrouding. By using a shorter plug, you are moving the initial ignition of the compressed air/fuel towards the very top of the chamber. This helps to produce a uni-directional flame front which radiates only downward toward the piston. So I would have to say that I disagree with your opinion on the matter.
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