I have a tvt691 engine with heads shaved around .135, 410 cam, arc rods, flywheel, 32mm mikunis, ec double springs and retainers, I set my valve lash at .005in and when I rev the motor I lose my intake push rod, has anyone else had this problem, I think I need longer pushrods because when the valves all the way closed I can push the intake pushrods off the rockers, any help would be appreciated