Chryco Psycho
Well-Known Member
I agree the slits are designed to force coolant all the way to the back of the heads not just bypassing at the front , opening those will cause more damage
I thank everyone for your expertise & input....and the winning solution is using a 195° thermostat.I have two Challengers that have undergone the same engine change-up, build design & overheating redults.
I recently changed out a 318 CID/904 Auto for a 440 CID/727 Auto. Installed a Holly Sniper fuel injection system.
The engine was built by a highly respected machine shop that focuses on race engines. We used standard heads, factory high performance exhaust manifolds, 15° advance, 4-core champion radiator with electric fans, new factory style water pump and 160° thermostat. Coolant is 50/50 water mix.
The Sniper's water temp reading runs about 195° to 202° in mixed driving. If I spend too much time at traffic lights, temps reach 225° or even higher.
I attempted to work any Trapped air out of the heads by raising the front of the car while the thermostat was open but no difference in results.
YesSo are you saying you changed the thermostat and problem gone?
I'm less concerned about boiling explicitly and more concerned about damaging various engine parts. isn't that still likely?I know everyone gets excited about 220°F or 230°F water temperature at idle, but as I've mentioned before, a 50/50 mix of antifreeze and water won't boil until 268°F. May be worrying about nothing.
good to know, thanks!As long as it's not for long periods of time. Have you every looked at the temperature of a modern car? My 2019 Cherokee trailhawk runs 215°F under normal conditions.