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the 347 (5.7l) is usually a 302 windsor with a .030 overbore and a 3.4in stroke
the 250kw windsors that ford had in the AUs were 342s i.e. std bore with the same stroke crank.
the 331 (5.4l) is usually a 302 windsor with a .030 overbore and 3.25in stroke (without the overbore it is a 327)
However - the 'new' boss 302 block can go to 347 with a 3.25in stroke by being able to be bored .125 over (from memory)
I have read that the cylinder sleves in the boss 302* are not long enough to accomodate the 3.4in stroke and that this is also the case with some early 289s (have no experience of this)
Boss302 was a special racing block that had 'tunnel port' heads/4 bolt mains etc
the new Boss302 block is basically set up to build a Clevor (Cleveland heads/Windsor block)
Hope this helps
LoBelly
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