This is why lightweight valvetrain parts are important. Not just the valves but the lifters and pushrods.Pro-touring72 said:Found this while seaching some info on rods..
• Reciprocating weight accelerates to a stop then changes direction. Rotating weight moves in a single direction. Loosely speaking, removing one ounce of reciprocating weight is more beneficial to longevity and efficiency than removing a pound of rotating weight. In other words, don’t waste time grinding the crank counterweights. Concentrate first on the rods, pistons, and pins.