I am wondering how come the tune-up specs listed on this site call for .018H and .030H while my 63 shop manual calls for .012H and .018H. I recently set mine by the shop manual and they just don't seem as loud as I am accustomed to hearing. I must add that I mistakenly set mine cold and do not know if that could be the reason they are so quiet. On the specs, I seem to recall that we always used 12&18 years ago. What's the real deal guys?