408 Magnum stroker running hot.

Ccas said

At 25-40mph, you are getting the absolute best air flow and a minimum amount of heat generated by the engine since it is low rpms.

The water pump pulley should be at least just slightly smaller than the crank pulley to create enough pressure in the system.

With overheating at speed, you can narrow it down to head gasket leak, malfunctioning wp, timing issue and not enough volume in the system.

Assuming you have dealt with the other issues, It is possible that the Champion radiator was clogged from the factory. That isn't impossible to happen. It is also possible that a 3 row is not enough volume for your motor.

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I'm going to assume the pump is fine. I had an OEM pump on it and since replaced it with a high volume. There is water movement through the radiator looking in. Im not sure if its enough and I don't know how else to tell.

The timing is at 16° and 33°. I have a limiter plate in a factory electronic distributor. I've played around with the timing some to try and solve this issue.

I thought the 3 core would be enough for what I have. I plan on putting A/C back into the car eventually but the condenser and such has been removed for now. I put an overflow/puke tank on it to help with keeping the system filled.

I haven't thought about a head gasket issue. I have changed the oil once already and I check it often. Its not milky. The exhaust is clear and doesn't smell like coolant. Do you think combustion gases are leaking into the cooling system?