PerTronix D1000 Flame-Thrower Black Cap Distributor HEI for Chevrolet Small Block/Big Block New lightweight aluminum alloy housing Aligned and honed high quality bronze sintered bushings for reduced friction and extended life Centerless ground corrosion resistant shaft reduces friction and provides concentric operation Distributor gear is ground to exact tolerances for tighter mesh with camshaft (Bronze distributor gear available) High dielectric strength cap with brass terminals and low resistance center coil brush