On 440 -1 heads. They start life at 75cc?, Max stated cut is down to 62cc. But as Dwayne pointed out to me, work on the heads can alter how much would have to come off to get to 62cc. In my case it ended up being too much for high (15/1) compression, and i had to have a head welded and fixed. Now i have what i consider to be the ultimate set of moderate compression heads! Someday maybe on a BIG pumpgas street motor😁
So if you plan on buying new 440-1 heads, mike the deck thickness, and only cut them half of what it would take to get to 62cc. I think that would be . 040. Now you have a set of heads that can survive refinishing the decks more than once. At a multiple of cuts totaling . 080, they might not like super high compression or heavy doses of nitrous.