here is a site with an excellent java engine size calculator
http://www.prestage.com/carmath/calc_cid.asp
KIT BORE STROKE ACTUAL SIZE
351 4.000 3.50 351.86
357 4.030 3.50 357.16
372 4.030 3.64 371.44
377 4.030 3.70 377.57
393 4.030 3.85 392.87
408 4.030 4.00 408.18
416 4.050 4.05 417.39
427 4.030 4.17 425.53
435 4.030 4.27 435.73
and the monster 351w
454 4.125 4.25 454.38
http://www.flatlanderracing.com/stroker351w454.html
I also think the 396 is just the 392.87. Most 396 kits advertise a 3.85" stroke...with a 4.030 bore that is the 392. If the bore is 4.050, then it would be a 396.78 ...maybe that is where it comes from?
Andy
http://www.cobralads.com