It is not. Those are 5 on a 10.5" BC.
FWIW, they are the same as '37 Fords. Those hubs are made to be as light as possible. I'm not sure how they'd stand up to Off Road racing. As I recall our newest hub, with races installed but no bearings, weighs a little over 8 pounds. They also use the 'wide' floater snout, not the 'narrow' floater snout used with the 5x5 stock car hubs. There's about 1.0"-1.25" more distance btwn the bearings.
TS
"It only seems kinky the first time"
-- Bumpersticker seen in Lost Wages