Crower 66493-16 Features:

Crower 66493-16 severe-duty mechanical roller lifters for BBC and Big Chief engines with raised-seat design +.300 in. taller body with 1.890 in. pushrod seat height fits taller lifter bores in Dart and similar aftermarket blocks .150 in. intake seat offset and .842 in. nominal OD with .750 in. bearing diameter for correct BBC geometry Lightweight billet alloy bodies with heavy-duty stainless steel alignment blade for stable lifter positioning in severe-duty use

Severe Duty Rollers Raise BBC/Big Chief .300 In. Taller Features:

• Raised-seat mechanical roller lifters for BBC and Big Chief, .300 in. taller body, .150 in. intake offset
• 1.890 in. pushrod seat height for tall lifter-bore aftermarket blocks, no lifter-bore grinding for clearance
• .842 in. nominal OD with .750 in. bearing diameter, standard needle-bearing severe-duty roller design
• Lightweight billet-alloy bodies with heavy-duty stainless-steel alignment blade for stable lifter positioning
• 131 g each, optimized for lubrication and cycle life in severe-duty valvetrains, designed for use without oil restrictors