http://intense-racing.com/Merchant2/..._Code=3800_HCV
"'Restricted oil flow' pushrods (PRO Series) were developed especially for the hydraulic roller market. Our engines begin to experience varying degrees of valve float at 6,000 or fewer RPM's due to the inertia mass of the roller lifters. INTENSE™ Oil-restricted Pushrods are constructed of 4130 seamless chrome moly, feature a .083" wall thickness and weigh 595 grams per set of twelve (approximately equal to the factory rods). The rocker arm ends are 210 degree radiused and there is a specially metered oil hole. This oil metering works to keep the lifter 'pumped up', and allows the engine to operate at higher speeds with less chance of a failure. These are the best choice for customers with any sort of power adder and/or full roller rocker arms."
