Replace thermostat , fill with coolant then leave the rad cap off for 30 minutes at idle to bleed air out and top off the coolant; that will do it.
No.
the temp of the intake manifold is controlled by the temp of the water in the block.
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.
maximum water temp. for all engines is approx. 90 c
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.
Below the water neck on the front of the intake.
most fuel injected 5.7 engines the water temp sensor is mounted in the thermostat housing where the upper radiator house connects to the intake manifold.
350 degrees F.
the water jackets are different , the motor will keep running hot
350 for 15-20 min
350 degrees
180 degree.