2/12/2023 0 Comments Chevy 8.1 vortec mpg![]() Instead of rubber seals, these heads feature viton valve stem seals for added durability. Our heads come with special high-lift dual valve springs with dampers, built to work with our high-lift series of camshafts and use CNC chromoly retainers. ![]() These valves are set in bronze guides for maximum reliability. These valves measure 2.19 / 1.75 and have thinner 11/32 valve stems to enhance airflow. Raylar uses stainless steel nitrated valves for maximum wear and durability. These steps are usually an additional charge with aftermarket head manufacturers, but is standard on our heads. We then port match our cylinder heads, maximizing airflow through the ports. In addition to these basic steps, all Raylar Big Power heads are further CNC machined in the valve bowls, combustion chambers, intake ports and exhaust ports. Typical aftermarket cylinder heads are cast and machined ensure the head surface is flat. Raylar Big Power CNC aluminum cylinder heads are engineered to maximize the horsepower and torque of the big block Chevrolet Vortec 8100 8.1L / 496 engine.
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