KZ vs NF, Overbore

Richard Hoffman billzcat1 at hotmail.com
Wed Nov 14 23:53:00 EST 2001


In the never-ending quest for knowledge and hp....

The main difference between the KZ block and NF block is the bore - KZ
smaller at 81.0mm, NF at 82.5mm.

What is the maximum overbore a KZ block can take?  Factory lists oversize
pistons up to 81.5mm but I was wondering if they could be bored up to 82.5
to essentially turn it into an NF block.  And then, maybe 83.0mm, the
factory-spec oversized (2+) pistons.

I was thinking that the cylinder walls would be thickest on the KZ when it
was stock - then you could bore it up to the NF size for a little more
displacement and still have a decent wall in there.

I'm sure there are tons of you out there who have had their KZ apart and
could probably tell if the block could take 1.5mm overbore.

Thanks!

Richard
1990 CQ 193K




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