SBC Stamped Long Slot Rocker 1.6 Ratio

The SBC Stamped Long Slot Rocker 1.6 Ratio from PROFORM delivers the valve train geometry precision that serious small-block Chevy builders demand for street and strip applications. Whether you're refreshing a 283, 307, 327, or 350 engine, these stamped rockers provide a cost-effective alternative to forged units while maintaining reliable performance across a wide RPM range. The 1.6:1 ratio multiplies valve lift and duration exactly as intended by your cam manufacturer, ensuring correct valve event timing and optimal cylinder head flow.

Stamped construction keeps weight minimal at 4.2 lbs for the set, reducing valvetrain inertia and allowing higher safe RPM limits compared to heavier forged designs. The long slot design accommodates pushrods and geometry variations common in OEM and aftermarket SBC cylinder heads, while the 1.6 ratio ensures your valve lift matches specifications exactly—critical for carburetor sizing, timing events, and cylinder head flow optimization. PROFORM's manufacturing tolerances hold rocker arm geometry within tight limits, preventing binding and excessive side-to-side movement that degrades valve sealing and increases wear on pushrods and valve stems.

These rockers excel in stock-replacing service on original small-block Chevys and budget-conscious builds where forged rocker costs aren't justified. They pair seamlessly with OEM pushrods, valve covers, and standard 7/16" rocker studs found on classic SBC heads—no adapters or modifications required. For carbureted street engines, mild crate motors, and bolt-together rebuilds, the SBC Stamped Long Slot Rocker 1.6 Ratio delivers straightforward, proven performance without the premium price tag of boutique valve train components.