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What stat do you run?
Small block Ford engine family models run best closer to 200*F, so a Motorcraft 192*F thermostat is usually best. This is what is run in all late model EFI small block Fords, including 302 and 351s. I live in Arizona where the summer temperatures exceed 110*F and it's fine, even being leaned out during cruise with factory Ford EFI retrofitted.

1971 Mustang fastback: 10.3:1 C90E 408W hydroller - CDAN4 EEC-V w/EDIS8, girdled, lowered and caged
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