This is not a chamber where I would sink valves to add volume.
Just curious,why???
Would you install a 2.15" intake valve?
I did not sink the valves that much,most of the volume was from opening up the chambers,which unshrouds the valves & in turn flows better.
Worked fine for me.It also flowed good.
At the time I did this,, I did not want to buy pistons & go through my engine all over again.
Just an option since it seems you cannot run flat top pistons in a 292 w/decent compression for the street.
There are tuliped shaped valves (adds volume) & flat,, straight suface valves.
