I went .060 over on mine also, so it is actually a 424 as well. I'm sure that the rod ratio argument is valid, but I've talked to several people who have been running 418 and 427 stroker Windsors for years without any issues related to the rod ratio. Mine is a street car that will not be reving much over 6,000 rpm, so I took the chance in exchange for more cubes.