To change the displacement, you need the 302 crank (with the larger stroke),
and then you'd have to bore the block to accept the larger-diameter 302
pistons. The problem with that is it can't be done reliably, due to
variations in cylinder wall thickness. If you want to build a stealth 302
(i.e. in a 5-bolt block) then you should start with a five-bolt 289 block,
which has the correct bore size to begin with. Then you just need a 302
rotating assembly to throw in there. Now that you've got 302 cubic inches of
displacement, you can get to work on a good set of heads to actually make
some power. There are huge variations in the as-cast performance capability
of the Windsor heads, so you need the right heads to start with... If you
have the budget, getting aluminum heads allows you to run higher compression
without pinging or detonation, which is good.
Without going into a lot of detail, it's impossible to describe all the
differences between a pedestrian 260 (or even a mid-70's 302, which was only
rated at something like 170 HP), and a street-performance oriented 302. The
short answer is, they won't share any components except the the oil pan and
the valve covers. It's much more cost effective to start with a complete
modern 5.0 engine, rather than try to put all that technology into a 260
block.
Best regards,
Theo Smit
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