With bore sizes maxed out and RPM as high as the antiquated push rod design
will allow; it’s often found that the flame can no longer keep up with the piston.
Those with unlimited resources have found that by moving valve centerlines
they can create a small squish zone around the parameter of the intake valve
to provide catalyst for combustion in the otherwise dead area.
Unfortunately the chambers on my SBC heads are already bigger than the bore.
Also note shallow chamber depth and central spark plug location.
