Highest flowing sbm heads?

Nick from Nicks garage runs his hemi to 8000 rpm every pass using all stock valve train , been doing it for years , has the trophes to prove it . Takes time and lots of work , lifts the wheels but does not ride the bumper , forget his best time

yeah, they shim up the lifters somehow.
the bumper dragger is his new( to him) NSS car.
the Drag pack car with the gen3 left way more tame