I have heard from a few people, not that I actually believe any of them, but it is worth checking with the experts, that you can cause valve damage if you use an exhaust system that is too short. I am planning on using Lakester style header on a SBC with no baffles. I want to make sure that if I do, it will not cause any damage to the motor. I also want get a definitive answer to this question. As always, any help is greatly appreciated.