Set of (16) Stock style rocker arms and 3/8 inch diameter puish rods compatible with 1966-1990 Chevy big blocks 396 402 427 & 454. Push rods are 3/8" diameter with .060 wall thickness. 5/16 diameter ball ends. Rocker arms are stamped steel 1010 Steel and for 1.72 rocker ratio. Fit stock 7/16 diameter rocker arm studs. Fitment includes: 396 engine 1965-70, 402 engine 1970-72, 427 engine 1966-69, and 454 engine 1970-1990.