SBC Shaft Rocker Arm Kit w/Bowtie 18 Deg. Heads

The T AND D MACHINE SBC Shaft Rocker Arm Kit with Bowtie 18 Degree Heads is a purpose-built valvetrain component designed for Small Block Chevy performance engine builds. This shaft-mounted rocker arm kit features a 1.60/1.55 mechanical advantage ratio and full roller construction, delivering consistent lift geometry and reduced friction across the RPM range. Built from aluminum with a natural finish, the kit is engineered for compatibility with 18-degree layback cylinder heads commonly found in street performance and racing applications.

The 1.60/1.55 rocker ratio means intake valves receive 1.60 times the pushrod motion while exhaust valves receive 1.55 times, optimizing flow characteristics across different valve events. Full roller rockers minimize valvetrain wear and enable higher RPM operation compared to stamped steel alternatives. The shaft-mount design provides superior rigidity and alignment stability under load, critical for maintaining valve timing accuracy in high-lift cam applications. The aluminum construction keeps overall weight minimal without sacrificing strength, a priority in performance engine packages where rotating assembly balance matters.

This kit serves engine builders, performance shops, and enthusiasts rebuilding or upgrading Small Block Chevy platforms for track use, bracket racing, or street performance. Proper installation requires attention to pushrod length, rocker geometry, and valve lash adjustment to maximize the benefits of the improved ratio and roller design. The 18-degree head specification is critical—verify head angle before ordering to ensure compatibility with your cylinder head casting.

Shaft rocker systems have become industry standard in serious Small Block builds due to their superior stability and repeatability compared to stud-mounted designs. This T AND D MACHINE kit delivers the precision engineering expected from a brand focused on valvetrain solutions for performance engines.