2015-up C7 Z06 and Z51 radiator was designed using GM cad data. This allows for a perfect fit. We use 4 and 5 axis cnc machines as well as water jet to manufacture all the brackets and hardware allowing for an extremely strong and appealing part. C&R uses 27mm close tube center core, the same core we use in professional race series such as NASCAR. Accepts The factory fan. No modifications to install.