Here's my logic.
Consider a stock Pantera with it's marginal cooling system, meaning the engine will rise to a safe and comfortable operating temperature sooner than later. Yes, in low temperatures you may not get heat when you want it, and you may increase engine wear a little, but given the few miles that these cars are driven who cares. I don't drive my car at anything less than about 45 degrees, and rising to optimal operating temperature quickly at anything over about 60 degrees ambient is NEVER a problem. A slightly modified Cleveland putting out more power would put out more heat, thus reaching optimal operating temperature pretty quickly is even more of a sure thing.
The "only thermostat that really works", 333-180 is not available.
Given this scenario, why do I need a thermostat at all? It's just another obstruction.
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