Cooling issues, could use some advice

I run block hugger headers, could the heat from them being so close to the block cause the problem?


This is driving me nuts. I run around with a few Dakota guys and they don't have any problems at all with that thin little factory core. Heck one of them runs 180 degrees no problem with no fan but some 16" universal fan. It's set up as a pusher and has a 3/4" gap between it and the core so I would think a good amount of air escapes out the side.

I just don't get it.