SBC 220 Sport Comp Shaft R/A Kit 1.50/1.50 Ratio

The SBC 220 Sport Comp Shaft R/A Kit 1.50/1.50 Ratio from T AND D MACHINE is purpose-built for small-block Chevrolet enthusiasts seeking refined rocker arm geometry and optimized valve actuation. Designed for sport and high-performance street applications, this shaft kit delivers the mechanical precision required to maximize valve event efficiency without the extreme demands of full race builds. Whether you're upgrading a restored 350, tuning a 327, or modifying a modern crate engine platform, this rocker arm assembly addresses a fundamental need: consistent, reliable valve control across the RPM range.

The 1.50/1.50 ratio specification indicates a direct 1.5:1 mechanical advantage on both intake and exhaust valve trains, a balanced setup ideal for street-strip and performance street engines where equal lift multiplication supports symmetric breathing characteristics. T AND D MACHINE's shaft design incorporates precision-ground hardened steel with tight manufacturing tolerances that eliminate the deflection and wear patterns common to cast OEM rockers. The rocker arms themselves feature optimized contact geometry at the valve stem, reducing side loading and extending component life while improving consistent valve sealing integrity across extended heat cycles and sustained driving sessions.

This kit benefits small-block Chevy builders seeking a middle ground between stock reliability and race-only complexity—ideal for street machines running mild to moderate cam profiles, aluminum or iron heads, and target horsepower in the 400–550 range. Installation requires correct pushrod length calculation and proper rocker stud torque sequencing; most experienced mechanics or machine shops familiar with SBC architecture can handle installation in a single session. The 15.54 lb assembly sits well within standard engine bay packaging and integrates seamlessly with existing bolt-pattern cylinder head configurations, making it a straightforward bolt-on upgrade for any serious SBC platform project.