Crower 68543-1 Features:

Crower 68543-1 dual valve spring with 1.550 in. outside diameter for high-performance valvetrain builds Dual-spring design with internal damper helps control valve motion in high-rpm racing applications 262 lb seat pressure at 1.850 in. installed height and 625 lb nose pressure at 1.200 in. Coil bind height is 1.110 in. and cylinder head machine work is required for proper installation

Valve Springs 1.550 Od Du Dual 1.550 In. Od, Features:

• 1.550 in. OD dual valve spring, internal damper design, heavy-duty valvetrain stability, helps control harmonics in demanding high-rpm racing applications
• 262 lb seat pressure at 1.850 in. installed height, supports aggressive cam profiles, helps reduce valve float under elevated spring load conditions
• 625 lb nose pressure at 1.200 in., engineered for high-rpm control, suited for custom-ground camshaft combinations exceeding 8000 rpm
• 1.110 in. coil bind height, optimized for high-lift performance setups, provides critical clearance planning for serious engine build applications
• Requires cylinder head machine work for proper installation, race-focused valvetrain upgrade, sold individually for custom spring and head matching