Quote Originally Posted by SicStang03
Actually it is the same for twin screws too. It's not just the heat from the stock blower. SVT neglected to make a coolant exit for the driver’s side head. There is also a tight piston to wall clearance and the lack of bronze valve guides in our heads makes them even more susceptible. So, too many back to back high speed runs (140mph+) could cause the car to overheat or damage the heads or pistons. The problem could also lead to the common head tick issue.

If you don't at least have a wideband or a engine temp gauge I wouldn't even consider it
What about a head cooling mod?

Edit: Plus, I'm pretty certain my car has the new heads in it too...its late numbered car. I have to verify that though...