[Chris442]

4.8 = 293
5.3 = 325
5.7 (LS1,6) = 346
6.0 (LS2) = 364
6.2 (LS3,9,A) = 376
7.0 (LS7) = actually should round up to 428, but 427 sounds a lot cooler

flash911 was on the money.

Note that all of the engines from 5.3 to 6.2 share the same 3.62 stroke.