PAC Racing PAC-1223 Beehive Valve Springs – Set of 16 for Ford 4.6L & 5.4L 4V DOHC Engines

Upgrade your Ford 4.6L or 5.4L 4V DOHC engine with the PAC Racing PAC-1223 Beehive Valve Springs. Designed for high-performance applications, these springs are ideal for engines equipped with aftermarket camshafts or forced induction systems. The beehive design reduces valvetrain mass and enhances stability at high RPMs, ensuring reliable performance under demanding conditions. Key Features: Drop-In Fitment: Compatible with stock retainers and seats; no machining required. Enhanced Performance: Supports up to 0.500" valve lift, suitable for high-RPM and boosted applications. Durable Construction: Manufactured from premium materials for longevity and consistent performance. Optimized Design: Beehive shape and ovate wire reduce valvetrain mass and improve spring dynamics. Specifications: Installed Height: 1.470" Seat Pressure: 90 lbs @ 1.470" Open Pressure: 252 lbs @ 0.970" Maximum Valve Lift: 0.500" Spring Rate: 324 lbs/in Coil Bind Height: 0.900" Outer Diameter (Base): 1.105" Inner Diameter (Base): 0.742" Outer Diameter (Top): 0.943" Inner Diameter (Top): 0.580" Mass: 37.6 grams per spring Whether you're building a naturally aspirated screamer or a boosted beast, the PAC-1223 valve springs provide the reliability and performance needed to push your engine to the next level.