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SBI 2302205L  
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If an Overhead Cam Cylinder Head has been excessively machined the distance between the Cam and the Crank centerline is too small. This will affect the valve timing and the engine will not run properly. There is also a very good chance that the engine will not pass emissions tests. SBI Head Saver Shims are designed to replace this lost height and restore the centerline distance. These Shims are 0.020” thick and are made from steel. They should be installed on the block surface directly under the Head Gasket. Overhead Valve Cylinder Heads are also good candidates for shims. Surface machining reduces combustion chamber size boosting the compression ratio and potential for gasket failure. On V6 and V8 OHV heads, thinner heads can cause intake manifold misalignment. The Head Saver Shim corrects this.


SBI Warranty Information:
12 Months For Substantive Defects in Materials or Workmanship