anyone know if someone has done a wet sleeve kit on an A series?

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Nissan sold liners for the A-series (dry liners).

It seems feasible that you could order custom 1" longer liners, and order a custom 1" de-compression spacer as used on turbo engine but thicker. And then build a super stroker.

The decompression plate interest me to raise deck height,
it would allow a variety of conrod choices like the e15et
that I want to use. A much cheaper option too for a laser
cut piece of steel that could be tig welded and then machined
after the machining for the stepped sleeves is made.
In that case an 87mm stroker would be possible with 136.65mm
e15et conrods.
87mm stroke
81mm offset bores
1793cc

Just bolt the spacer down with a head plate, tack weld it and bore the cylinders. Remove the head plate and press the liners in. Could you use a copper gasket between the block and decomp spacer? Or is it complicated than this?

A17 engine ...
I'd be trying for a reliable A16 (76mm pistons, with long stroke).

A18 really but yes the a16 would be easier and cheaper.
However imagine 80 or 81mm bores, 42mm inlet valves,
33mm exhaust valves and the gas velocity of the oval
ports with the extra 300cc over stock 1500cc.

edit: just found out that a full C sleeve is an easier option
at $500 dollars in and out, this is Ultrasonic tested, full
cemented and shouldered sleeves.
However I asked about 80mm sleeves not 81mm as there is probably
not enough material or space for 81mm sleeved bores?

this would mean 80mm bores x 87mm stroke : 1749cc so A17 :)

Hmmmm, if your going to go full wet sleeve, what about 82-83mm bores with a E16 crank....

OS Giken rb30 has a 26 block with a spacer plate and liners so it can be done
engine swap would be a much cheaper option

My question is whether or not you can modify the heads sufficiently to flow enough to support the needs of the larger motor??
On A-series minis, you can get the 1275s out to 1600cc with offset (and huge) overbore and offset ground crank, but they only end up making the same power (with only very very very marginally more midrange torque) as 1400 odd cc ones which are much rev happier, and last a lot longer (and cost less).

It would be a huge ask to try and add deck height to a cast iron block, you'd have to have it nearly glowing red before you start to weld and let it cool in a barbecue or something with lots of hot coals to let the temp die down slowly, lest it crack

The spacer plate isnt needed for 87mm stroke at 1.6 rod stroke ratio.
I believe anything over this will defeat the purpose of performance.
The Fiat twin cams had 88.5mm strokes but the hemi style heads.
SR20de and many others 86mm stroke. Daihatsun HD detomaso 1.6 87.6mm.

With a spacer plate and a good penetrating welder, it can be done using
a cold block but in very small spaced tack welds spread out sections.
Once it cools the process can start again and again.
The spacer plate will most likely need to be a sliced section of another
A series to maintain the same composition to stop different expansion
and contraction rates. But in order to attain 90mm stroke with longer
rods I think it will be only a street engine with limited gains.
This is clear in Suzuki engines especially using the same head specs on
each, these 16v sohc heads are similar to the triumph dolomite versions.
The 84.5mm stroked 1.5 litre version has the same power and torque curves
is better on the 1.5. It has 2nm less torque than the 1.6 but occurs at
3000rpm instead of 4000rpm. For 2nm less torque at a 1000rpm less Id
prefer the 1.5. In indonesia they use the g15 for the suzuki APV and in
Australia they use the g16. Yet in Indonesia with heaps more hills and
loading they use the 1.5 with an auto, where here it was never offered.
With porting, valves and cams, I think a compromise stroke between the
two would be the safer bet at 86 or 87mm stroke.
There are many factors but I believe a well ported oval head with 1700cc
and 86 or 87mm stroke will have a mid range to be proud of.
Also the smaller 77mm bore will allow boost with enough thickness.

If the bores can be had at 82mm with bigger valves and 87mm stroke then
at 1800cc the wet sleeving exercise would surely be worth it as the Oval
heads can flow as much as many 1.8 liter 8v heads of the past.
81-82mm bores should allow unshrouded 43mm inlets and 34mm exhaust?.

Also to make the 86/87mm stroke the cheapest way would be to offset
grind the crankpins on an A15 crank but need a 133 rod with 40mm B/E.