Armond, place the bare head on a bare block, turn it over and view it from the crank side....you will probably find that the intake side of the chamber is equal to or slightly extends beyond the bore.....if the chamber is opened up beyond the bore then the top of the block becomes restrictive....when I open up the chamber I blend a radius to match the head in this area of the block....please don't take this as gospel;it is something I have done over the years with different engine packages .....I don't have the capability of flowing a block and head together; perhaps someone with more research capability could verify the practice for us.....fats
