If you are asking about the water temp, older ones were usually 180, newer ones were 195. If you are asking about the exhaust gas temp, 1350 is safe.
Normal temp for a 71 El Camino 350 is in the 185 to 195 degree range. The thermostat can be changed to a different temp to make the engine run a little hotter or cooler.
The engine should run at about 200-240. Anything over about 250 will cause engine damage if run that hot for some time. GoodluckJoe
later model 350's run thermostats around 195 degrees, but older 350's didn't run that hot of a thermostat. I've seen them as low as 160 to 180 degrees on older 350's.
195 to 197
Should be about 50% of your temp scale on the dash. As per manual. Info courtesy of www.Dranoweb.com
3.90
if you have a differential temp gauge installed the temp will run a little lower than engine temp it is close in range, but generally a little lower
198 degrees min running temp. 210 max running temp. The hotter the temp the more fuel economy.
Around 190-210
That actually varies from motor to motor. But commonly they will run safely till about 320 degrees, then it starts getting really tempremental. You take the chance of warping a cylinder wall or seizing a piston to the side wall.
A 402, is a 396, .030 over. With a thinner cylinder wall, it will heat up a little faster, and higher. Cylinder head warpage occurs around 230, or 240. Your motor should never run this hot on a consistant basis. 180, to 200 degrees should be the normal operating temp.
185-220 deg F