SBC Shaft Rocker Arm Kit w/Dart 13 degree Heads

The SBC Shaft Rocker Arm Kit with Dart 13 degree Heads is a critical valvetrain component engineered for small-block Chevrolet engines running Dart's popular 13-degree cylinder head casting. This kit addresses the precise rocker arm geometry and lift ratios required when transitioning from stock or cast iron heads to aluminum Dart heads, ensuring correct valve actuation and preventing binding or excessive wear. Serious engine builders and performance enthusiasts rely on purpose-built rocker arm systems to maximize cam profile efficiency and maintain reliable valve control across the entire RPM band.

T and D Machine shaft rocker arms deliver superior rigidity and load distribution compared to stud-mounted designs, thanks to a solid steel shaft that supports the entire rocker assembly and resists deflection under high valve spring pressures. The 165-plus-100/155 configuration specifies the rocker arm ratio and pushrod seat diameter, ensuring optimal lift multiplication and compatibility with your Dart 13-degree head's valve centers and intake/exhaust port geometry. This system is built to handle aggressive cam profiles and elevated spring tensions found in stroker builds, small-displacement high-revving engines, and fuel-injected street performance applications without sacrificing durability or precise valve timing.

Builders working with Dart 13-degree heads—whether in a dedicated race engine, restomod project, or modern carbureted street machine—benefit from this matched valvetrain kit's engineered compatibility and proven reliability. Proper rocker arm selection prevents valve recession, reduces pushrod flex, and ensures consistent valve lift across engine load conditions. Installation requires alignment with your pushrod length, intake manifold clearance, and fuel line routing; consult T and D Machine specifications or an experienced engine builder to confirm fit with your specific block, head, and cam combination before final assembly.