I don't think so. The tighter lash does make the cam seem a little bigger, but don't go overboard with that either. Of course the more you drive it the more you will need to check it. Just don't do like I did and overthink it or do it to much. Jesel are good rockers and you shouldn't have any problems or very much movement. My suggestion would be to get them all the same as the spec sheet says HOT (may take a few times to get all of 'em right) then find whatever feeler guage fits that setting when it's cold and use that from then on. Just remember if you error, error on the tight side and I mean from snug to firm, not snug to tight and you'll be ok.