Sponsored Links (Register now to hide all advertisements)
I think the answer is "it depends"! LOL
I tend to run high-lift and higher performance cams with small base circles and heavier spring pressure than stock. I also use very high quality valves. If anything, I've see the lash increase in these situations - maybe .001 to .002.
Some aftermarket cams have a lot of break-in lubricant on them - which when it wears off, increases the clearances a bit.