DaveInDenver
Member
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.
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.