Thanks for all of the replies. I searched as usual to find... yes they will work, no they will self destruct if you idle too much, etc. I have a solid roller setup on a procharged SBC, but I tend to rev it a bit at the stop lights. I did run an Isky rev kit in it before the huge cam I was running broke some of the springs in the rev kit and chewed up some of the aluminum cups. Smaller cam went in and haven't had an issue. The blown 440 is the wife's car and I'm just trying to sort which cam setup I should go with using the advice of people who have done this more than I have. Thanks. Dan.