The final touch to any small block Fits Chevy 262-400 project with headers. Beautifully chrome plated hex head bolts with 3/8"-16 x 3/4" threads. Set of 12. Also works on AMC 290-401, big block Fits Chrysler 383-400 (exc. 426 Hemi), Fits Pontiac 326-455, and Fits Oldsmobile 330-455 engines.