Captainfab
Newbie
OK, so a L31 Vortec 350 originally came with a roller cam. Is the cam you installed a factory style roller cam? Did you purchase and install new pushrods at the same time? If so and someone gave you pushrods for a flat tappet cam, that is likely the issue. But as already has been said, the pushrods bent because there was an interference issue somewhere. Either the valves contacted the pistons, the spring retainers bottomed out on the top of the valve guides, or both. I agree with TechNova. Your engine needs to come apart and be inspected for the total extent of the damage. I would be very surprised if bent pushrods is the only damage.