858-16 Pro Magnum Hydraulic Flat Tappet Lifters SBC BBC Small and Big Block Chevy. 350 454

COMP CAMS SMALL BLOCK AND BIG BLOCK CHEVY HIGH PERFORMANCE RACE HYDRAULIC FLAT TAPPET LIFTERS

These Pro Magnum hydraulic lifters are designed to perform at high RPM without any harmful pumping up. These lifters for Chevrolet Small/Big Block and 348-409 yield significant power increase over standard hydraulic lifters.

PRO MAGNUM™│Hydraulic Flat Tappet Lifters

• Specifically designed to perform at higher engine speeds

• Proper position of internal piston at higher RPM prevents lifters from harmful “pumping up”

• Unique design yields significant power increase over standard hydraulic lifters

• Adjustable valve train required

• Pre-load .002"-.004" w/ engine warm

 
APPLICATIONS

• Chevrolet

  • Small Block V8 265-400
  • Big Block V8 396-454
  • Big Block V8 348-409 ('58-'65)

SPECIFICATIONS .842” Diameter • 99g Weight • 1.93” Seat Height

The following instructions cover the correct guidelines for installing COMP Cams® Pro Magnum™ and Race Hydraulic Lifters. All Pro Magnum Lifters™ require an adjustable valve train for proper operation. Through various testing we have discovered that the recommended lifter pre-load should be set between zero and 1/8 of a turn for optimal performance. Although the method for setting pre-load on a hydraulic flat tappet and hydraulic roller lifter are the same, the break-in procedure for each lifter is not. Please review this break-in procedure for flat tappet camshafts.