COMP Cams Camshaft C43 260H-R10Stock Gear Ratios and Converter 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 noticeably taller than the non balance shaft version. Catalog User 1 This Part Fits: Year Make Model Submodel 1987 2005 Chevrolet