We put these on the existing Champion holes. But the aluminum was too thick for them even after I bent them out some. So we thinned the alumnum out some and also made the shroud end rails fit more flush.



When the radiator was still in the car I marked the centerline of the water pump translated to the radiator itself. This way we would know where to start the center of the fan shroud opening later. I also had the upper shroud tab welded onto the radiator along this centerline.

We added foam to make a tight seal and to protect the shroud from rubbing into the radiator tubes/fins.



Foam detail