408 Magnum stroker running hot.

scampy said
I don't see anything about a trans cooler or if its running to the radiator, if it is might be adding additional heat.

I do have a good sized external trans cooler. The trans fluid doesn't go through the radiator. I pulled the trans cooler away from the radiator and tucked it into the lower valance to eliminate that as a possible issue.

Kendog 170 said
Pulley sizes make a big difference. If too much flow it wont cool. Slower flow give coolant time to cool down in radiator. What size crank and water pump pulleys do you have. Also I'm not an expert on pulley sizes and such but know it's important that is why I'm throwing it out there. I'm sure someone will chip in on what sizes may or may not work. Also what about Post #2 ?

I'm using the Magnum serpentine belt setup. The water pump pulley is welded/fixed to the pump. All of the other pulleys are factory.

I have flushed the 50/50 coolant out of the system. I removed the upper hose and started the car up. I ran water into the radiator and let it pump it all out through the system out the upper hose. I then drained all the tap water and refilled with pure distilled water and water wetter. I do have flow at idle.

jdsduster said
coolant flow issue,lower rad. hose being sucked shut maybe?

The lower hose has a stainless steel spring in it to prevent it from collapsing. The block and intake were hot tanked and cleaned at the machine shop when the engine was built. The radiator, heads, hoses, thermostat, are all new. I dont know what could be clogged or plugged up.