Crower 74159F Features:

Crower 74159F stainless-steel shaft rockers for SBC engines with BRODIX Dragon Slayer DS225cc 23° heads and 5/8 in. shafts Fully rollerized precision needle-bearing fulcrums help reduce friction and support stable valve control at higher RPM CNC-precision-machined ball-race alloy steel shafts are double heat-treated and micro-finish ground for strength and durability Hardened tip wheels and aircraft-quality 12-point nuts are built to handle demanding racing conditions and high operating temperatures

Shaft Rockers SBC Dragon 23-Degree Ds225cc Heads 5/8 In. Features:

• Fits BRODIX Dragon Slayer DS225 cc 23° SBC heads with 5/8 in. shafts for precise valvetrain geometry and secure shaft-mounted stability
• Stainless steel shaft rockers with fully rollerized precision needle-bearing fulcrums for reduced friction, smoother operation, and reliable high-rpm performance
• CNC-machined ball-race alloy steel shafts, double heat-treated and micro-finish ground for maximum strength, wear resistance, and heat tolerance
• Hardened tip wheels and aircraft-quality 12-point nuts support demanding racing use while helping maintain valve control under elevated rpm loads
• Needle-bearing roller tip design helps free horsepower, reduce valve guide and stem wear, and improve valve spring life through lower operating heat