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Morel lifters are unlike any lifters you've ever seen before. The lifter body is fully machined from alloy steel bar stock, not a casting like OEM lifters. Steel bodied lifters built to tight clearances. Redesigned valving that prevents pump up during higher engine speed. Will accept higher seat and open load spring pressures so that damping of the lifter at high rpm can happen without collapsing the plunger assembly. .675” maximum recommended lift.