i just built a new motor for my truck. started it up and ran great. then it overheated.
timing seems ok. no flow through the radiator. top radiator hose gets hot and pressureizes but bottom stay cool. brand new 180 thermostat from napa installed spring down. i assume it opens cause the top radiator hose is hot. pulled the thermostate out and doesent overheat of course but runs to cold.
thanks cody