16Pcs 1218-Style Beehive Valve Springs for GM Gen III/IV LS

This aftermarket set contains sixteen 1218-style steel beehive valve springs for the documented GM Gen III and Gen IV LS valvetrain applications. The package supplies one spring for each valve in the stated 16-spring configuration. The recorded spring dimensions are 1.290 inches outside diameter, 0.885 inch inside diameter, 1.800 inches installed height, 1.200 inches open height, and 1.140 inches coil-bind height. The recorded loads are 130 pounds installed and 318 pounds open, with a listed 313 pounds-per-inch spring rate.

The set contains sixteen single beehive springs only; a separate damper spring is not included. Retainers, locks, valve seals, spring seats, valves, rocker arms, pushrods, lifters, camshaft, and other valvetrain components are not included. The PAC1218 reference identifies the 1218-style specification family and does not represent these aftermarket springs as genuine PAC Racing Springs. Spring selection also depends on the complete valvetrain geometry, lift, installed height, retainer and lock combination, coil-bind clearance, and intended operating conditions. This listing states the recorded spring specifications and package quantity without claiming a universal performance result or compatibility with every camshaft profile.

Features

• Sixteen aftermarket 1218-style steel beehive valve springs.
• Single-spring configuration with no separate damper spring.
• Recorded 1.800-inch installed height and 1.140-inch coil-bind height.
• Recorded 130-pound installed load and 318-pound open load.
• Recorded 313 lb/in spring rate.
• Retainers, locks, seals, seats, camshaft, lifters, and other valvetrain parts are not included.