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The factory did this in many trucks powered by big blocks. The single ~12" fan is controlled by a temperature switch installed in the right cylinder head via a relay mounted on the firewall. I added one to my SBC with A/C and enjoy excellent results. I wired mine to integrate engine overtemperature with A/C overpressure controls. The forwardly mounted fan does not appreciably disrupt air flow through the radiator when idle. I recommend this upgrade, especially when residing in hot climates.
Quote from: bd on June 11, 2018, 03:38:01 PMThe factory did this in many trucks powered by big blocks. The single ~12" fan is controlled by a temperature switch installed in the right cylinder head via a relay mounted on the firewall. I added one to my SBC with A/C and enjoy excellent results. I wired mine to integrate engine overtemperature with A/C overpressure controls. The forwardly mounted fan does not appreciably disrupt air flow through the radiator when idle. I recommend this upgrade, especially when residing in hot climates.My only issue is I can only add 1 or 2 9" fans in front of condenser due to the limited space because of the hood latch bracket. Bracket is at an angle inward from top to bottom and this is primarily due to that is where the grill mounts. I measured 10.5" on each side of the bracket and not much room for one behind bracket. I believe a 10" would be too large.
Mount it for best fit. Choose the fan based on CFM flow, the greater the better, but be realistic about advertisers' claims. Any chance you could install a larger diameter fan? If I get the opportunity, I will snap and post a "through the grille" pic of what I run.