Radiator Cap This is the cap of choice for all domestic radiator options. With a 23psi rating it is a perfect fit for street/custom, and race applications. This is the most popular choice when choosing to replace a cap. Increasing your working pressure allows your cooling system to handle higher temperatures and offer a higher static boiling point. For every pound of pressure exerted on the coolant in the system, the static boiling point of the coolant is increased by 3 degrees F. Keeping coolant in a liquid form allows the fluid to do it’s job transferring heat to the radiator to be dissipated. Coolant that is boiling cannot transfer as much heat and overheating is likely to occur. With a 40psi rating it is a perfect fit for High Performance Street, Custom, and Race applications. Increasing your working pressure allows your cooling system to handle higher temperatures and offer a higher static boiling point. For every pound of pressure exerted on the coolant in the system, the static boiling point of the coolant is increased by 3 degrees F. Keeping coolant in a liquid form allows the fluid to do it’s job transferring heat to the radiator to be dissipated. Coolant that is boiling cannot transfer as much heat and overheating is likely to occur.
