Brand: Longacre Racing Products
A high-pressure radiator cap helps to ensure against overheating. Raising your coolant pressure will raise the coolant boiling point (1 psi adds approximately 2°F to the boiling point, depending on your coolant mixture).
These high-quality cap from Longacre is rated to 30 psi nominal pressure (holds between 29 and 31 psi). Fits standard full-size SAE "A" size radiator necks (necks measuring 2.2" / 56mm OD) only. Sold individually.
Before installing a high-pressure cap, have your cooling system inspected and pressure checked to make sure that it can handle the increased pressure.
Note: This style is designed for "open" cooling systems only. If your radiator or header tank vents into an open catch tank, this cap will work. Modern cars with "closed" systems which draw coolant back into the system from an expansion tank will need to use a different type of cap.
