Crower 74030F Features:

Crower 74030F shaft rockers for Mast LS3 510-203 heads, for .650 in. or less valve lift 17-4PH stainless steel rockers with 1025 heat-treating and rollerized design for valvetrain stability Arm length 1.480 in. with .350 in. intake offset and .050 in. exhaust offset for correct geometry CNC-machined ball race alloy steel shafts, double heat-treated and micro finish ground for accurate timing

Shaft Rockers Mast LS3 51 For .650 In. Lift, Features:

• 17-4PH stainless steel rockers with 1025 heat-treating, rollerized design, and oversized needle bearings for stable high-RPM valvetrain control
• For Mast LS3 510-203 heads with .650 in. or less lift, featuring 1.480 in. arm length, .350 in. intake offset, and .050 in. exhaust offset
• CNC-machined ball race alloy steel shafts, double heat-treated and micro-finish ground for accurate valve timing and reduced valve guide wear
• Alloy steel tip rollers, chromoly sure-lock rocker nuts, and lightweight bodies for precise lash adjustment and large spring clearance
• Uses stand ID 005F with stand part 74400X005F; optional needle bearing tip, DLC-coated pin, or EnduraMax bushing upgrades available