Crower 74031F Features:

Crower 74031F shaft rocker system for MAST LS3 510-203 cylinder heads with camshafts over .650 in. lift Features 1.480 in. arm length, .350 in. intake offset, and .050 in. exhaust offset for application-specific fit CNC-machined ball race alloy steel construction is heat-treated twice and micro-finish ground for valvetrain durability Shaft-mount design helps maintain exact geometry, reduce valve guide wear, and support accurate valve timing at high lift

Shaft Rockers Mast LS3 51 For .650 In. Plus Features:

• CNC-machined ball-race alloy steel construction, double heat-treated, micro-finish ground for valvetrain durability and stability
• Optimized for MAST LS3 510-203 heads with over .650 in. lift camshafts, preserving precise rocker geometry under high-lift use
• 1.480 in. arm length with .350 in. intake offset and .050 in. exhaust offset for correct fitment and valvetrain alignment
• Exact geometry control helps reduce valve guide wear, support accurate valve timing, and improve high-RPM valvetrain consistency
• Uses Stand ID #102F mounting base; shaft-mount design adds rigidity for demanding max-lift and heavily modified engine combinations