New to fourm please help.
I have a 1973 W200 with a 360 motor and auto transmission. I am trying to install headers on the truck. I bought a set oh Headman headers part number 79178, and a set of Flowtech 33500 headers both headers hit the frame. The truck has new motor mounts and the motor sits center in the frame. Help please.

 

sometimes that happen. i have heard of people notching there frames to fit headers.

 

If I were putting headers on my truck I'd do just that, but I would weld in a few triagular braces on either side of the notch just to add some strength to the frame rails

 

for the amount of money those headers cost (the headmans) I think I would call them and complain. there should be no reason the headers would hit the frame in a dodge pickup. there is enough room. Now if the engine mounts were wrong installed, then it would be a possibility but I dont think it is to easy to screw that up, basically they wil only fit one way. When you say hit, do you mean when it is running or do you mean that they cannot be installed at all because of the interference? Anyway call them and see if "frame notching" is the norm to install those things.