Whos saying values less than that are OK and based on what ...0.040" is half the recommended value from anything I've ever read.
Well there's about 2-300 years of high performance experience in this thread alone, For example,
Mike Reick {JMR drag racing proprietor, engine building guru}
Mark McGrew {M3 racing proprietor, Dayton winning 750/4's and much more}
Big Jay, {CBR Zone and Ape engineering proprietor and engine guru}
Mec, {Engineer and racer, Owner of home built Egli racer with 1000cc monster engine with awesome home made mods, including the frame}
Now considering that these guys have multiple titles both on the strip and on the track i would say without hesitation that the know what they are talking about.... Actually, these guys are amongst the most knowledgeable people on the planet when it comes to these bikes....
I expect a discount now guys.....
;)..J/K