no headers, all stock as far as I can tell except put a Holley 750 on it. I put all the panels and baffles back on it and it got hot by the time I got home. Just enough to start spitting a little out the rad overflow. BUT, it restarted just fine. wierd. I pointed my nifty temp gun at the thermo housing and it read 210. My gage must be off some. I was getting 220 on the gage. saw a post about water pump impeller clearance. might try that next.