745139 10PCK Valve Spring Shim 1 437X 645X 030

These valve spring spacing shims by Kibblewhite Precision Machining are designed for professional cylinder head restoration and performance tuning. They are used to adjust the installed height of valve springs, a necessary step after performing valve seat work or installing new components. By using these shims, builders can ensure that spring tension meets specific requirements, which is essential for maintaining valvetrain integrity at high RPMs. Kibblewhite produces these shims to high standards of accuracy, making them a reliable choice for correcting height variances. They are indispensable for achieving a precise and balanced valvetrain setup in V-Twin engines.