Valve Spring Shims

Valve spring shims are critical for dialing in the correct seat pressure and load curve in high-revving engines. This PAC shim kit gives you four thickness options—0.015", 0.020", 0.030", and 0.050"—so you can fine-tune spring preload without replacing...

Valve spring preload directly impacts cam lift, duration, and overall engine responsiveness—and even small discrepancies can cause valve float or reduce performance. The Comp Cams 1.500 O.D. Spring Shim Kit gives you precise control over spring pressure...

Valve spring shims are critical for dialing in the correct spring pressure on your cylinder head—too much pressure causes premature wear, too little invites valve float and catastrophic failure. This Comp Cams kit gives you three shim thicknesses in a...

Valve spring shimming is critical for maintaining proper seat pressure across your entire RPM band—too little pressure causes valve float and power loss, too much accelerates component wear. This Comp Cams shim kit gives you the precision adjustment...

Valve spring shim selection is critical for maintaining proper seat pressure and preventing valve float in high-RPM applications. This Comp Cams shim kit gives you precision thickness options to fine-tune your spring preload without replacing entire...

Valve spring shimming is critical for maintaining proper spring pressure across your entire RPM range—too little pressure causes valve float and loss of power, while too much accelerates component wear. This Comp Cams shim kit gives you the precision...