Two things make that unlikely; cars have to grip the road and by the time you're getting close to G limits tires will start to skid and second the forces aren't

Two things make that unlikely; cars have to grip the road and by the time you're getting close to G limits tires will start to skid and second the forces aren't in the right directions. For the former the closest a car gets to the levels that induce G-LOG are Formula 1 cars during braking (~5G) and during cornering (4-6G) [0] so even the highest performing cars out there you're just barely approaching where you might threaten G-LOC. The latter is why I think it won't really happen though because the acceleration is (basically [1]) never vertical like in fighter jets during climbs and turns. The forces in a car are, w.r.t. the human riding, forwards, backwards, and side to side and those directions don't force blood out of the head. Braking gets closest because the feet are furthest forwards but it's not quite the same. [0] Acceleration is a measly ~2G at peak [1] To avoid pedantry there is a case but that's on extremely high bank turns that only exist on test tracks really, NASCAR track banks might get close but I don't think get Gs there get high enough before cars break free up into the wall to threaten G-LOC.