COMP Cams Camshaft Cv6B 266HR-12For '92 '14 GM 4. 3L 262 cid 90. V6. Balance shaft Equipped Engines. Works with Throttle Body and Sequential Port Injection with Aftermarket Chip. Good Low End and Mid Range. 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