Steel C/M Spring Seats - 1.270 x .600 x .520

PAC Racing Springs Steel C/M Spring Seats (1.270 x .600 x .520) are precision-engineered components designed for serious engine builders and performance mechanics upgrading valvetrain geometry. These spring seats serve as the stationary foundation for valve springs, directly influencing spring preload, valve control, and overall cylinder head performance. Proper spring seat selection is essential for reliable operation and valve float prevention in high-performance applications.

Constructed from durable steel, these seats provide consistent spring pressure and durability under demanding conditions. The 1.270-inch outer diameter, combined with a .600-inch inner bore and .520-inch height, creates a compact profile that is well-suited for tight cylinder head applications. This design maintains an adequate contact surface for spring retention, crucial for high-revving engines.

Engine builders, performance shops, and enthusiasts undertaking serious valvetrain modifications on small-block and intermediate-displacement engines will benefit from these spring seats. They are ideal for those upgrading camshaft profiles or increasing valve spring tension, allowing for seamless integration into both OEM and aftermarket cylinder heads without extensive porting work.