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Originally Posted by Gasoline Fumes
I'll admit I don't know the effects of lash on emissions. But increasing lash will reduce lift and duration, which is what you want for low-RPM. Most of my driving is at 1200-1500 RPM and I noticed a slight improvement in torque with excessive lash. And a lot more noise!
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I am no expert, either. Here is the main text I have been examining... it is called "THE IMPACT OF VALVE EVENTS UPON ENGINE PERFORMANCE AND EMISSIONS" and the best way to get it is probably through a google search for the title. It is a PDF. I downloaded it without trouble so it seems safe. Take a look at how it explains the effects of timing valves. Lots of subtlety but in pretty ordinary language. Really useful. See if you read it the way I did.