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Chevrolet Big Block Intake Valves

3. We chose Manley titanium valves and retainers to make the valvetrain as light and reliable as possible. The intake valves measure 2.450 inches in diameter and have 5/16-inch stems, and the exhaust valves are 1.80 inches in diameter with 11/32-inch stems.<br />The valvesprings are LSM's 700A 1.670-inch od units, minus the inner spring. The cam profile is designed around this particular rate, and by removing the inner spring, it all works out. Pressure at the seat is 310 pounds, and the open pressure is 835 pounds.
Chevrolet Big Block Engine - The Big-Block From Hell

 3. We chose Manley titanium valves and retainers to make the valvetrain as light and reliable as possible. The intake valves measure 2.450 inches in diameter and have 5/16-inch stems, and the exhaust valves are 1.80 inches in diameter with 11/32-inch stems.
The valvesprings are LSM's 700A 1.670-inch od units, minus the inner spring. The cam profile is designed around this particular rate, and by removing the inner spring, it all works out. Pressure at the seat is 310 pounds, and the open pressure is 835 pounds.  View Related Article

 

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