Pro Magnum Anti Pump up Hydraulic Flat Tappet Lifters SBC BBC Small and Big Block Chevy. 350 454 & Holden 308

COMP CAMS 858-16 Small Block Chevy 350 & Big Block Chevy 454 Hydraulic Flat Tappet Lifters. High Performance - Anti Pump up & heavy duty clip

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.