COMP Cams Camshaft C43 270AH-R14V6 Non Balance Shaft Engines with Hyd. Roller Cam. Performance Cam For Computer Cars Needs Aftermarket Chip, Exhaust and Mild Stall Strong Mid Range and Top End. Adjustable Valve Train Required. Balance shaft equipped 4. 3L engines were introduced in '92 but GM continued to produce the previous version until '94. Non balance shaft 4. 3L's (' 85 '94) shared their timing cover with the small block Chevy V8 engine. The balance shaft 4. 3L's timing cover