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Manufactured with lightweight aluminum technology
if you want more airflow then you should grab up one of these Speedmaster X-Stream air flow top plates
28 & 31 spline axles:Requires bearing PCE231
These chrome water necks from Speedmaster add a touch of class to your cooling system
Pontiac 455 OEM 2 Bolt to 4 Bolt Straight Billet Steel Main Caps Manufactured with lightweight aluminum technologySpeedmaster billet main caps are precision CNC machined from superior quality 1025 billet steel. These extreme main cap sets consist of the center three caps. Speedmaster billet main caps improve reliability in highly stressed engines by reducing distortion of the main bearing bores, and increasing the cap's resistance to closing up under high loads.
