[Lew Ledyard]

I had the same issue until I ditched the underdrive pulleys. People are quick to point to airflow through the radiator. Given, that is important part of the equation. But the ability to cool depends on having an adequate amount of air pass over a sufficient amount of water. If the flow of either air or water is insufficient, then the coolant will not be cooled by the air enough to absorb and dissipate the heat generated by the motor. The underdrive pulleys, a street RPMs, don't flow enough water for the Cobra application.