[jmcarter]

While they are technically legal for the SS/Modified classes they don't flow enough for that and as noted porting them can easily lead to reducing the heads to Junk. Also as noted these are fine for street or brackets, I ran a set in Super Street years ago and have them in the shop (had them listed on here for sale ) but nobody stepped forward so they are for a future "project"....back in the day they were referred to as the "Econo" head.