SPAL fans have awesome CFM. However, I have run into issues with their high amp draw. Specifically melting relays (Bosch and Narva) and encouragement to run higher amp alternators that create more drag and belt squeal (more so when running a flat firewall kit). If memories serves they draw about 27 amps each depending on size. Perhaps twice the amp draw of others with slightly less CFM. No free lunch.
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