OK, i know I'm being an annoyance here,and I'm sorry for that, but, if i can't trust the math.......well it's not worth the paper i printed it off on.

here is the problem, if I us Rays last example, then verify it with Stan Weiss calculator, AND use the "Diameter" choice, they both come out the same at 2.2365 or 2.24

If i use 86rocco math, i get 2.19635 or 2.20. Using Stan's Calculator, its also Right.

"IF" I us the "Radius" option......................

so is it 2.20 or 2.24?

Not trying to cause trouble here, just wanting to know.

O almost for got, the port is 2.25" by 1" = 2.25 right?

1/4" drill bit fits in the 4 corners of my intake port.

and here is the link to Stan Weiss calculator.

http://users.erols.com/srweiss/calccsa.htmNOTE: I'm entering .25 in to the 4 corner spots

Thanks to every one that has posted up so far