No, the 4.3 uses a different crank and longer stroke whereas the 4.5 is stroked AND bored.

When I first booked in the work, I new what bits were involved, but I had no appreciation of the labour involved!
I had toyed with the idea of doing it myself, but you'd need a pretty well kitted out engineering workshop!
http://www.pistonheads.com/gassing/topic.asp?h=0&a...