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Also, a mechanical fan will move more air than an electric one. This argument goes on and on, but I'll give you an example that is in print in a book called Chevrolet TPI and TBI Engine Swappping by Mike Knell. In it he cites that a 1984 Camaro four-cylinder came with the same radiator core as a 1/2 ton truck with a 305. The Camaro used an electric fan, the truck a mechanical one. In his opinion (and mine) overheating is often caused by an electric fan, not cured by it. For the reocord, I have a stock radiator and a mechanical fan and I never overheat. In fact, it never gets any hotter than the six did and my EFI computer verifies that, it's not just the temp gauge indicating that.
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A daily driver 1985 FJ60, 300HP TBI 350, NV4500, NP241, 14-bolt semi floater rear w/Elocker, 4.56 gears, SOA, four-wheel disk brakes, 35" BFGs, 360,000 happy miles and still going due to a wicked case of wander lust.
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