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These billet aluminum engine cooling fans are specifically designed for the Corvair engine with the goal to provide more cooling air delivery than a 1964-69 magnesium fan, as well as delivering more pressure. The power requirements to drive the Nash Fan is less than the stock Corvair fan and you will notice a performance increase at engine speeds above 3,000 RPM and a dramatic performance gain in engine speeds over 5,000 RPM. Nearly one decade of research and development has been devoted to the design and manufacture of this fan.
If you would like a glimpse of some of the development and testing, this Corvair Center thread is a good read.
Other Notes.
These custom fans are intended for all Corvair engines using a 1965-69 fan bearing hub.
All Nash Fans are dynamically balanced to a 10,000 RPM fan speed.
The Nash Fan is available in a 'Reversed' geometry for reverse rotation Corvair engines. Please inquire.
Nash Fan Color Examples
The Nash Fan is supplied ‘as machined’, in a billet type finish. Anodizing of the Nash Fan is available as an extra service. A number of colors are offered, including Clear, Red, Blue, Purple, Black, Gold and Green. Other colors and custom mixes are possible. Please inquire. 
Picture by: Patrick Croan
Please see our other Billet Products as well as our many other fine products and services for your Corvair at the: Corvair Performance Parts Page