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Message: <blockquote data-quote="Silver95bird" data-source="post: 1428179" data-attributes="member: 21743"><p>I've been looking at pictures of lash adjusters here on break at work, and it sure looks like the oil inlet is smaller than the exit. There's no way significant pressure is building up in there. I'd hazard a guess the hot engine oil, restricted at the inlet, doesn't pump much more oil through under high rpm. It's all about lubricating the follower. Every rotation squeezes oil into the follower under pressure when the cam moves off the base circle. On the base, it refills the adjuster. Hence, spring pressure in the adjuster is King. It's really nifty design. Shimming may be limited by where the inlets and bores line up though. That'd be worth investigating.</p></blockquote><p></p>