Yup, 2 and 3/4 or 7/8 right at it anyway. Thats what mine are. With some port matching done on mine closer to 7/8.
...I hope your manifold finds a new home in Hawaii.
Hey I need TWO of those 427 air cleaner nuts listed at 7.99 and no current bids. You got one or TWO? Lets make a deal and ship them with "my" new intake manifold.