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**mr48chev** · 10-30-2010, 07:03 PM

200 is 12 degrees below boiling so that shouldn't be any problem. Guys are still living in the dark ages where flathead Fords and 216 Chevy sixes had big issues if they got up to the boiling point but a lot of the newer engines are designed to run at the higher temps. Most 500 Cad engines have 205 thermostats and most 75 and later GM small blocks run 195 thermostats from the factory.

On yours if it goes up to just 200 when you are in slow moving traffic and drops back down to just over the rating of the thermostat when you hit the open road I'd say life is pretty good. On my 71 I can't get it hot enough to get good heat out of the heater. I run a 195 thermostat which is factory for the 79 350 in the truck and still freeze my butt off on the highway at low temps.

10-30-2010, 07:03 PM	#2
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,839	Re: What is too hot on thermostat? 200 is 12 degrees below boiling so that shouldn't be any problem. Guys are still living in the dark ages where flathead Fords and 216 Chevy sixes had big issues if they got up to the boiling point but a lot of the newer engines are designed to run at the higher temps. Most 500 Cad engines have 205 thermostats and most 75 and later GM small blocks run 195 thermostats from the factory. On yours if it goes up to just 200 when you are in slow moving traffic and drops back down to just over the rating of the thermostat when you hit the open road I'd say life is pretty good. On my 71 I can't get it hot enough to get good heat out of the heater. I run a 195 thermostat which is factory for the 79 350 in the truck and still freeze my butt off on the highway at low temps.