- Generous 18-inch cooling diameter suited for large-block radiators
- Flexing blade design reduces engine drag and parasitic power loss
- Superior low-speed air draw keeps coolant temperatures stable
- Slotted center hub fits standard aftermarket and factory water pumps
- Black-coated steel construction ensures corrosion resistance
The Cal Custom 18-inch mechanical cooling fan features flexible steel blades tailored for high-demand thermal management. The fan blades automatically flatten out at elevated speeds to lower engine load and mechanical noise, while maximizing airflow when stationary. With a universal slotted bolt pattern, this 18-inch flex fan mounts easily to standard water pump hubs, providing dependable engine cooling for large-capacity V8 engines.