Small Block Chevy 265-350ci 1955-98
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These short travel retro-fit hydraulic roller lifters feature a short travel. These lifters' short travel allows for light pre-load and reduced oil volume for the highest revving lifter for Chevrolet Small Block.
With full travel hydraulic lifters, higher RPM in performance engines is often limited by the incorrect positioning of the lifter's internal piston, which inevitably "pumps up" during the engine cycle. This improper location results in open valves and therefore leads to lost horsepower and sometimes even engine failure. With COMP Cams Short Travel Race Hydraulic Roller Lifters, the patent-pending design minimizes internal piston movement to cut down on open valve issues and allow higher engine RPM (thus increasing horsepower).
The surface of these lifters has been black oxided to significantly reduce surface friction, wear, and lubrication temperatures. This creates a high-performance, high-quality component.
Yes, most hydraulic lifters need ~1 turn of pre-load. These are short travel lifters.Their plungers have much less travel. The comp instructions say 0-1/4 turn. Is this is done hot or cold? What if you have Al heads? Txs!
What is the proper way to set preload? If setting on a cold engine, you need to preload so the lifter plunger is 1/2 way through its travel, right? Then add .006 more preload for Al heads?
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
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WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.