Block Guard - Supertech - 2ZZ-GESupertech High Performance Block Guard for 2ZZ GE Engine Supertech Block Guards are engineered to provide critical reinforcement to open deck engine blocks in high stress applications. Whether you're building for boost, high RPM, or race level abuse, these CNC machined inserts improve cylinder stability and reduce the risk of sleeve distortion and cracking. Each Block Guard is manufactured from high strength aluminum alloy and designed for an exact
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