Broke a valve spring a week ago on my engnbldr head which is super weird because my cam is within stock parameters, I rarely rev over 4K maybe to 4.5k at the very very most (and that is almost never) and, on top of all that the head is supposed to be they’re nicer USA head. Swapped the spring out meticulously without having to remove the head with a LCE spring and the truck runs great again. I’m just wondering about having a mismatched part in my valve train. Thoughts?