I think PRH mentioned earlier-skinny z wrote: ↑Mon Jan 10, 2022 7:38 pm Something very timely from Weingartner Racing.
At about the 5 minute mark he describes exactly the condition of my combustion chambers.
https://www.youtube.com/watch?v=iVR0BctDhjM
The general consensus of the crowd here aligns with his approach to correcting the problem as well.
Weingartner.jpg
Weingartner (Brodix IK200)
Mine.jpg
Mine (RHS Pro Torker)
Time to grind.
Just sand roll sharp edge and I would not grind that area out just to try to blend that shallow top cut.
You can possibly do some work around the spark plug area but again you need to know the why and how to do it correctly.
Looking at Larry's 292 combustion chamber is a work of art in my opinion I hope we can see a picture of the valve job.
Larry has done extensive valve unshrouding but it is not dug out like a lot of people do,you can see how Larry has tried to make the top cut transition all the way to the cylinder wall diameter,impossible to do on a 23 deg head.
I am wondering if Larry angle milled those heads and how much to achieve said chamber volume.
I have done no valve unshrouding on those Dart heads but remember it has 1.94" - 1.5" valves.
If I wanted to lose compression I would keep the chamber tight on shape and CC and take it out with piston dish and quench area not exceeding 40 thou piston to head.just my opinion