There are some Colombian circuit guys running these pistons on A12 engines
https://www.ebay.com/itm/4x-Mahle-Pist ... :yRcAAOSwQG5ZwjkA&vxp=mtr

I conversed with them in spanish on their forums which was
alot of work for me but I was eager to see what they did
and they happily said they sleeved and grouted A12 engines with
A14 crank and tops of pistons milled 2m to clear.


I checked out
http://www.ozdat.com/ozdatonline/enginedesign/
I tried A12 with A14 crank and only has -3.4mm deck clearance
using stock rods yet still has 1.578 rod stroke ratio which is
better than most Hondas that rev sky high.

Problem with pistons is they have 21mm pin holes so need
sleeved pin insert on the slugs to suit the 17.5mm pins
As bushing the usual A12 rod is too much to 21mm.
There are other pistons but I gave up and felt custom slugs
would be the way to go and later A12A rods.
These guys dont run big cams but like speedway in Oz
all stock except allowed capacity increases!
so pistons valve clearance arent a problem.