Ok, great. So what I've done is.. with stones 'kwikway cool blue, multi purpose black and tan finish stone on the 45'..grind the 4 angle and then hand die grinded the chamber below the short side only as much as 30 degrees as to the top cut but steeper approaching the cyl wall side.
Now I dont want to give any impression that im saying this is the perfect valve job, no, in fact I'll probably play more n take another 75 drop to open it up. Its cracked test head from the videos. I'm more so saying 'after seeing pics here of some others' that this is more so the least IMHO you want to do. I'm doing this as helpful..not an .."I'm bored so let's throw tomatoes at my friends"....its 'here,let me see.. ok this is good... or okay you need to do this...' .
@Mr. Sinister
I'm Justin. What's your name?