1.600 Dual RAD Valve Springs

The 1.600 Dual RAD Valve Springs from Isky Cams are precision-engineered valve springs designed for high-performance engine builds and aggressive cam profiles. These dual springs are essential for serious engine builders and mechanics tackling racing applications, street performance rebuilds, or modified carburetor and fuel-injected powerplants that demand reliable valve control at elevated RPM. Proper valve spring selection is critical—undersized or fatigued springs cause valve float, which destroys power delivery and risks catastrophic engine damage through valve-to-piston contact.

Isky's dual RAD (Radial Advance Design) springs use a nested, dual-wire configuration that maintains consistent load rates across the full lift spectrum while minimizing surge and harmonics at high RPM. The 1.600-inch outer diameter and carefully calculated spring rates work in tandem to control valve seating velocity, reduce distortion under sustained load, and extend service life compared to single-wire springs. The compact 3.5 x 3-inch footprint ensures fitment in tight cylinder head configurations, while the 6.2-pound weight specification reflects the precision-wound coil construction typical of OEM-grade performance springs used in circle track, street rod, and bracket racing engines.

Mechanics and engine builders installing aggressive aftermarket cam profiles—anything exceeding 0.450-inch valve lift or 240+ degrees of duration—should specify these springs to match their camshaft's designed spring seat pressure and load characteristics. The 1.600 Dual RAD is compatible with small-block Chevy, Ford 351C/M, and similar displacement platforms where head geometry accommodates the spring diameter. Proper installation requires checking installed height and seat pressure with a spring checker tool; mismatched springs will cause valve train instability and premature failure regardless of camshaft quality.