New from the shop 410 SB stroker has a strange thumping or popping sounds, seems some of it is the fuel pump?? some of it sounds like its from the open headers but not sure.. Oil psi is very good at idle. it sounds like lower end, but not in one area i can not find anything banging or hitting under the truck, when i rev the engine it goes away. I would hate to think i would have to pull the engine again.

Would open headers make a popping sound ( almost like a thumping) this noise sounds the same no matter where i am on the truck, top, bottom,either side.. should i run it with exhaust? any ideas?

thanks

Don