This is a pic of what a ported 1.88 915 looks like after the 1st 2.02 45 degree seat is cut, no plunge. From there the lower 60, 75 and then the top chamber 30 degree narrows to the proper seat width of .050
Follow up pics of finished will be next and then some final massaging.
View attachment 1715413228
View attachment 1715413229