Boundary 89-05 Ford/Mazda BP (All Types) I4 Shim Kit (7/14/21/28/35 PSI) w/Retaining Pin

This kit from Boundary includes five different shims for your oil pump, along with a retaining pin. You get shims rated for 7, 14, 21, 28, and 35 PSI, allowing you to precisely tune your engine's oil pressure. This is a common service when rebuilding or modifying engines to ensure the oil pressure is within the desired range for optimal lubrication and performance.

These shims are well-built and designed to fit your specific oil pump application. The included retaining pin helps keep the shims securely in place during installation. By swapping out the stock shim with one of these, you can raise or lower your oil pressure to suit your engine's needs, whether it's a stock rebuild or a performance build.