Can running only headers cause any harm to a engine?

 

depends. What engine? Why only headers?

 

It's a built 355 with a estimated 350ish horsepower. Just to hear what it sounds like, use only headers at tracks and car meets.

 

no you wont have a problem. you wont have any back pressure, but you wont damage the engine. so it might not run as well. but you wotn damage anything. but if u dont have headers than you cna throw a spring. opr a valve.
open header be fine though.

 

Hard on the ears thats about it.