If your not trying to go for matching numbers car im running a fan out of a mid 80's big block truck which is 19.75in. I ran it without a shroud for a couple years and never had a problem but recently made a sheet metal shroud due to a near finger loss. The fan comes up nearly an inch over the top radiator support and well I just wasn't paying attention. But I never saw temps over 180 at idle unless its the middle of a beautiful 120 California summer day. For those days there's a 17 inch electric pusher fan mounted on the front side of my radiator that's on its own temperature switch mounted to my radiator.
Fat fingered from the phone- Corey
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72 Malibu-Built 468bb, turbo 400 w/ shift kit & 3000 stall, 12bolt eaton limited slip locker 3.55. Rocking the bench seat and rally rims.
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