They are full dish pistons and have been in storage since 1966 or 1967 according to the information in the piston box. They were made by Associated Engineering, England. No idea how they made there way to Nova Scotia, but they were included in old dealer inventories likely from Isenor Motors in Halifax or Irving Boss Garage in Maccan, NS.
As you can see from the photos there are dark areas where there is slight surface oxidation. This will be cleaned off a bit later.
The directions state that the bore should be .040 plus up to .0010. After much honing all the bores are .0010 or less over .040.
I’ve removed all the rings and bagged them with a piston number. I also scratched a piston number in the top of each piston.
Next I’ll tackle the crank.