Crower 84533 Features:

Crower 84533 mechanical roller tappet component kit for Mopar LA V8 273, 318, 340, and 360 engines, 1967-up applications Includes dual valve springs 68725-16, retainers 86071-16, and seals 87055D-16 for performance valvetrain setups Spring specs: 264 lb seat pressure at 1.800 in., 556 lb nose pressure at 1.250 in., and 1.150 in. coil bind Designed for engine speeds up to 6500 RPM; requires longer stem valves, machine work, and a 3/8 pilot shaft when ordering

Kit Mopar LA Dual Spring Mopar LA V8 273-360, Features:

• Fits Mopar LA 273, 318, 340, and 360 V8 engines, 1967-up performance valvetrain upgrade for mechanical roller applications
• Dual valve springs with 264 lb seat pressure at 1.800 in. and 556 lb nose pressure at 1.250 in. for stable high-RPM control
• Mechanical roller tappet kit engineered for up to 6500 RPM with 1.150 in. coil bind specification for performance engine builds
• Includes 16 dual springs, 16 retainers, and 16 seals for a complete cylinder head spring conversion service package
• Requires longer stem valves, longer pushrods, and minimum .050 in. retainer, seal, and valve guide clearance at full lift