COMP Cams Camshaft C43 251HR-14For '87 '94 GM 4. 3L 262 cid 90. V6 Non Balance shaft Engines with Hyd. Roller Cam. Works with Stock Computer and Fuel Injection. Low Lift For Non Modified Cylinder Heads. 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 noticeably taller