I started work on my 193s yesterday, using this video series for reference.
I started with the head that had the worst valve seats, and I really think the head is garbage. It's a good thing, because I think I dorked it up. It's only my second time porting heads. When I was unshrouding the intake valve, like he shows, I bounced out of the pocket a couple times and put a dimple into the quench area. I recommend putting masking tape across the bottom of the combustion chamber so you don't do the same, but there's a good chance you have more experience than me.
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I started with the head that had the worst valve seats, and I really think the head is garbage. It's a good thing, because I think I dorked it up. It's only my second time porting heads. When I was unshrouding the intake valve, like he shows, I bounced out of the pocket a couple times and put a dimple into the quench area. I recommend putting masking tape across the bottom of the combustion chamber so you don't do the same, but there's a good chance you have more experience than me.