Crower 66491H-2 Features:

Raised-seat mechanical roller lifters for BBC and Big Dart blocks with .842 in. lifter bore diameter and .750 in. bearing. Severe-duty cutaway design uses a .300 in. taller billet alloy body to clear tall late-model lifter bores. HIPPO high-pressure pin oiling uses EDM-fed lubrication from the oil band directly to the needle bearings. One-piece body, heavy-duty blade, and longer control-contoured tapered needle bearings support high cylinder pressure and high rpm.

Severe Duty Rollers Raise Raised-seat BBC .842 In. Hippo Features:

• Raised-seat cutaway design for shorter pushrods, reduced valvetrain mass, and improved valve control in high-rpm racing applications
• HIPPO EDM pin oiling feeds needle bearings directly from the oil band for targeted lubrication and extended cycle life under high-load conditions
• 0.300 in. taller billet alloy body clears late-model tall lifter bores; 0.842 in. bore fit for BBC and Big Dart blocks
• 1-piece severe-duty mechanical roller construction with heavy-duty blade and 0.750 in. bearing for rigidity, axle trueness, and load capacity
• Rebuildable pair of control-contoured tapered needle bearing lifters for high-cylinder-pressure engines and irregular tappet alignment correction