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Try SPAL fans. They may not have direct replacement part numbers, but they are the same kind GM HIGHTECH performance used on thunderchicken, there 396 LT-1 Firebird. They loved them.
My 396 with the facotry fans runs around 185 all day here in Hawaii, and that is with a BECOOL radiator. The Be Cool requires allot more air flow, and when I hit the highway, 167-174 + - 2 degrees with air on.
Yep the stock fans are fine. But I am looking for something that could replace the twin fans with a single large fan that can provide equal to or greater airflow than the twins. I may need more room for a T Trim blower installation so I was trying to cover my bases.