I use a 2006-2007 Chevy HHR fan on my 22" radiator, it kept my 410 stroker (540+ hp) motor cool on the streets, and between rounds on the track on hot days. It has a full shroud, pulls over 3000 CFM, and for about 50 bucks it is one of the cheapest options. All you have to do to make it fit is a little trim off the tabs on the sides.
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