Morel Hi-RPM lifter set for Chevrolet – Stock diameter hydraulic roller, stock travel. Fits GM .842″ diameter lifter bores.

Morel Hydraulic Pre-load Settings –

Cast Iron block and Cast Iron Head = .020″ – .025″
Cast Iron block and Aluminum Head = .030″ – .035″
Aluminum block and Aluminum Head = .045″ – .050″

The Hi-RPM hydraulic lifters are made from a billet body and have a clipped axle. These lifters have 7000+ RPM capability with .120 plunger travel and have an 80% fill rate with the test oil. These lifters have a .750 diameter roller wheel. The Internal tolerances are much tighter in this series. Do not use oil heavier than 5W40! Recommended spring pressures are 100-225 lbs seat pressure and 350-550 lbs open pressure.