I've heard of that... Springs going dead after a heat cycle... I've got to tell ya.. I have never rechecked any springs I've ever had.. But real world experience is I've built my Duster for abuse and after a year and a half of such I've had zero trouble front them...
As far as I'm concerned just mentioning this is food for the internet Boogeyman BS.. again yet to hear anyone who's had a problem with these heads except for the people that know they were cast in China and that's their big hang up not an actual misfunction..
I feel foolish for having them checked out and not just doing the simple check out myself. First place I called laughed and said they wish they could sell brand new heads that had to be inspected. The second place I called said they would need over $900 worth of work to rebuild everything because they're not good heads. And the last place I went to charge me $95 and said there was nothing wrong with them except the lubricant had dried up just a little bit from sitting on a shelf too long.. it wouldn't have made them bad but since he had them apart he took the extra precaution of relubricating them.... And hindsight I could have done the checks that he did likely and re-lubricated them...
My suggestion with these heads is to stop listening to all the internet guru tales about them and buy them on Black Friday for $700 bucks to your door fully loaded, take them apart with the Harbor Freight spring remover clean them up and re lubricate them and run them like you stole them I know I do..
