Visited with my engine block today....

mopowers said
I'm with Toolmanmike.

(4.03/2)^2 * π * 3.79 * 8 = 386.7489743. But who's counting...

Mopowers has it.

It's 387 CID because if it's anything over 386.000 it rounds up. Always has.

If an app or something says something else, the something else is wrong.