[tom406]

Strength wasn't an issue at all. NHRA approved/certified them after seeing the tests Hurst subjected them to. George Hurst made them almost in response to all the half-a$$ed wheels being cast at the time that were ostensibly for high performance cars but were weaker than the stock rims.

They were very spendy at the time, probably 2-3 times the going rate of most of the wheels being offered. They weren't very successful at the time, probably due to cost, but are obviously highly prized now. (Kind of like Pink Hemi Cudas and the like....)