I had to check and make sure I wasn't in the race part of the forum as this mod seems to be concerned with sustained rpm's over 4k. I used 273 rockers on my stroker motor last season (damn budget!!) and noticed no oiling problems. It's been discussed many times the seemingly inconsistency in the 1.5 ratio of 273 rockers? With this said a car sustaining over 4k rpm's is likely a competition car? 273 rockers are a great durable stock unit. Personally at my earliest (budjetable) convenience I bought what I believed to to be a much more proformance oriented rocker. I feel happy leaving my 273 rockers in their original condition with standing a little bit of clearancing for the springs and stop adjusters for the next guy or the next motor I have.