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351W are often stroked to 408. You can push any of these engines further by compromising the strenght of other components like pistons, cylinder walls, etc. You could go to a maximum displacement on an engine that was to operate at lower rpms, no NOS, no supercharging, compression of 10:1 or...

Not true... the 302 cylinder bores are identical to the 289. In fact... I challenge you to tell me where there is any difference in measures in either engine block. There is none.

351W and 302 differences The 351W is identical to the 302 from about 8.5" up the deck downward. Both are 4" bores but the 351W has a longer stroke and longer deck (longer piston bores). Both are SBFs and will bolt up to the same bell housings, motor mounts, etc. Even the timing chain cover...