Hydraulic Roller Cam; For '87-'94 GM 4.3L/262 cid 90³; V6 Non-Balance Shaft Engines with Hyd. Roller Cam . Performance Upgrade For Stock Cam - Good Mileage - Smooth Idle - Requires Adjustable Valvetrain. Works with Vans Pickups and Towing; Stock 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.
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