starting issue

guys, can you help me out with this starting issue -

My car is not wanting to start a lot of times when it gets hot - Sometimes I will hit the key and the starter will not engage (like it has hit a bad spot) If I short the solenoid with a screwdriver it will turn the starter over and then she will turn freely again. I have replaced the starter with a pretty expensive one from NAPA and still does the same thing
I do have headers and am wondering if they along with the heat is causing any of this?

Any thoughts??

PS - 360/727 68 barracuda

Sounds like maybe your ignition switch is on it,s way out?Does the car start after its hot?

We have a 70 Dart 360/727 with Hooker Competition headers. It hasn't been completed that long but I have noticed that a few times after it has gotten hot, upon restart the starter spins very slow. In those instances, after a few minutes cooling down, the starter spins freely and it starts right back up. I feel that this occurs because of the headers being so close to the mini-starter. Note: I took it on a 90 mile round trip last week and did not have this issue. I assume it was because it was primarily highway driving and limited stop and go driving. I know that this is not exactly your issue but just thought it would be helpful. If this continues, I will be picking up some heat wrap for the starter.
As for thoughts on your issue, I agree with Petty. If you can jump the solenoid and the starter engages like it should then the problem has to be in the ignition IMO. Good luck.

thanks guys,

it seems like it doesnt like to start when hot

i will put in a new ignition switch and cross my fingers - thanks for the point in the right direction - FABO rocks!!