Heater,after years of "shaping" the bolt boss (including machining for a thin wall Satinless insert)I recently followed the advice of many here and removed the boss in preparation for lumps....I spent a third of the time in removing as I normally do in shaping....in terms of time and effort the lump process wins hands down ...from all reports the gains in flow will too.....it really opens up access to the bowl area of the port allowing further refinement ; the back wall of the common area between seats always gave me fits before.....fats
