69 351W overheating
Having problems with the engine getting very hot after about 30 minutes of driving... It hasn't overheated too severe yet, been trying to figure out the issue before it gets to that point.
Issue: drive for about 30 minutes, temp gauge goes to about 3/4 of max (if I drive longer it maxes out)... If I turn the car off and try to turn it back on it's very hard to start.. Almost like the pistons swell inside of the cylinder (expansion from overheating??)... If I wait for about an hour or so it'll fire up no problem
Current cooling system is a 3 core aluminum radiator, belt driven water pump, 180* thermostat, using a mix of Redline's water wetter and 50/50 water/ethylene glycol
So far I have tried different mixtures of cooling fluid, 50/50; straight water, hy-per-lube... I have drained everything and ran a garden hose through it forward and back.. i have replaced and removed the thermostat, thought it might be a timing issue so i replaced the balancer and re-timed the dizzy..
Really not sure what else to check.. The only thing I can think is there might be something blocking a coolant passage... What's the best way to check this?.. My next step is to take it to a shop.. I just hate to give up on it