COMP Cams Camshaft C43 280H-R10V6 Non Balance Shaft Engines with Hyd. Roller Cam. Limited High Performance Street Use Needs Intake, Headers, 2500+ Stall and 3. 73 to 4. 10 Gears. Mild Rough Idle For Carbureted Applications. 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 is