GSC POWER-DIVISION Valve Guides [TOTAL LENGTH 39.12MM | OUTER DIAMETER 11.06MM | VALVE STEM DIAMETER 6MM | PROTRUSION HEIGHT 16.76] (Audi R8 5.2L V10) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS