Piston To Valve head clearance question

I've never heard that, but would be interested in the answer too.

From TFS website:

Twisted Wedge heads feature an exclusive combustion chamber design. The patented 61cc chambers
feature rotated intake and exhaust valves moved over the center of the cylinder bores. As a result of
optimizing the valve locations, valve angles, and combustion chamber shape, the Twisted Wedge heads
use stock height exhaust ports without power loss.

The heads are machined for 2.02 in. intake/1.60 in. exhaust valves to build top end power without sacrificing
bottom end torque. They don’t require flycut pistons for use with cams up to the specifications listed—no other 2.02 in.-valved
head for small block Ford offers these features

The valves are cantid.