I have a set of Dart Pro 1 325 Heads that have never been hurt. They have been ported and have had larger 2.300 intake valves installed. They have low runs on the valve job and springs. Springs are double solid Roller setup for .800 lift. Asking 2,900.
I also have the dart stud girdle for an additional $200.
These were on a 565" in a 2550 Ib door car that ran high 5.20s to mid 30s
