Track Smart Chevrolet 200-262, 4.3L 1.50 3/8 Long Slot Steel Rocker Arms The ultimate race rockers for applications where stock-type rockers are required. Precision die formed for the most accurate ratios of any stamped steel rocker. Nitro-Carbided to give 3-5 times greater resistance to wear, fatigue and fracture in high stress areas. Eliminates pushrod cup and fulcrum failures. Long-slot design for higher lift cam applications. Includes oil-groove pivot balls and adjusting nuts. For all race applications where rules require stock type rockers. This includes oval track, plus NHRA and IHRA “Stock Class” categories where stock-type rockers are required. Made in the USA.