Shim Kit - Secondary/Hi- Speed 6an Jet Can Valves

The Shim Kit - Secondary/Hi-Speed 6AN Jet Can Valves from Kinsler is a precision bypass shim assembly designed for high-performance fuel system tuning on race engines and modified powerplants. This kit is essential for achieving accurate pressure relief calibration in secondary fuel systems, where precise flow control is crucial for engine performance and fuel delivery consistency.

This Kinsler Hi-Speed bypass shim kit includes one primary 0.183-inch shim and six secondary 0.030-inch shims, all crafted from corrosion-resistant brass with a natural finish. The shim stack mechanism adjusts the preload on the valve spring, allowing tuners to control the pressure threshold at which the bypass valve opens, which is vital for maintaining optimal fuel rail pressure under varying engine loads.

Competition fuel system builders, EFI tuners, and drag racing teams will find this shim kit particularly beneficial when calibrating secondary fuel circuits on multi-stage or high-boost systems, enabling repeatable tuning without the need for valve replacement.