SBC Shaft Rocker Arm Kit - 1.6/1.5 Ratio

The SBC Shaft Rocker Arm Kit - 1.6/1.5 Ratio from T AND D Machine is the go-to upgrade for small-block Chevrolet builders seeking improved valve control and sustained performance gains. Whether you're building a street engine, weekend warrior, or high-RPM track motor, this rocker arm kit directly influences how efficiently your cylinder head breathes at critical RPM ranges. This is not a cosmetic upgrade—it's a fundamental component that affects power delivery, valve timing precision, and overall engine reliability under sustained load.

The dual-ratio design—1.6 and 1.5 rocker arm ratios—provides versatility for different camshaft profiles and intended RPM ranges. Rocker arm ratio multiplies the lift generated by your cam, so a 1.6 ratio delivers more aggressive valve opening compared to a 1.5 ratio, making it ideal for higher-lift cams and aggressive intake/exhaust timing. T AND D Machine's shaft-style rocker arms offer superior stability and reduced deflection compared to stud-mounted designs, maintaining precise valve geometry throughout your rev range and minimizing the risk of valve float. The shaft design also promotes consistent oil distribution, keeping rocker pivots and roller bearings properly lubricated even during sustained high-RPM operation.

This kit suits anyone serious about SBC performance—from restomod builders seeking period-correct reliability to engine shops assembling competitive small-block combinations. Installation requires a compatible shaft and rocker arm studs, so verify your cylinder head design and valve cover clearance before ordering. The 16.7-pound kit represents a complete rocker arm solution, eliminating guesswork when upgrading from worn factory hardware or transitioning to a more aggressive cam profile. Pair this with quality pushrods, a properly sized fuel system, and tuning adjustments to unlock the full potential of your small-block investment.