Chevy Small Block Vortec Cylinder Heads Specifications - Heads Up!
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The O-ring must be accompanied by a tin shield over the outside of the valvespring (left). The tin shield keeps excess oil from splashing on the valve stem and valveguide. The tin shield and O-ring must be used together to be effective. Installing the earlier double-groove valves, an O-ring, and a tin shield will allow the Vortec heads to use camshafts with 0.500 inches of valve lift, without machining the valveguides lower for clearance. View Related Article
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