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Like their NASCAR inspiration, the XTC-R heads have raised exhaust and intake ports to smooth out the sharp curves that plague original Cleveland heads; the intake is raised .500 inch, and the exhaust .700 inch. The 2.185x1.68-inch intake port requires a specific gasket from FPR, but the 1.8x1.57-inch exhaust port uses standard 4V Cleveland exhaust gaskets. View Related Article
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