Crower 74712F Features:

Crower 74712F shaft rocker system for BBC World Products Aluminum Merlin III with 5/8 in. stands and 1-piece intake stands for direct installation with no machining required. 17-4PH stainless steel rockers with 1025 heat-treating, premium oversized needle bearings, alloy steel tip rollers, and sure-lock rocker nuts. Configured with 1.650 in. arm length and zero offset on intake and exhaust for precise valvetrain geometry on Merlin III cylinder heads. Lightweight body design clears large-diameter valve springs while the rigid shaft system improves stability for high-RPM racing and marine endurance use.

Shaft Rockers BBC World P 17-4PH Stainless, 5/8 In. Features:

• 17-4PH stainless steel shaft rockers with 1025 heat-treating for high-temperature strength and extended service life
• Exact-fit Merlin III valvetrain geometry with 1-piece intake stands and 5/8 in. stands for no-machining installation
• 1.650 in. arm length with zero intake and exhaust offset for precise alignment and stable high-RPM operation
• Oversized needle bearings, sure-lock rocker nuts, and alloy steel tip rollers for reduced friction and secure adjustment
• Lightweight spring-clearing body design for rigid valvetrain control in racing and marine endurance applications